The tables currently have 9358 entries from 94 different contributors


last updated at 2025-10-09 07:41:17

Top Contributors

LJCR 2643
A. West 2416
Jan de Heer and Steve Muir 949
Franco Atzeni 841
Colin Barker 316
Alessandro Jurcovich 244
Terenzio Lazzarotto 237
Dietmar Pree 211
Michael Dambmann 169
Moshe Milshtein 119
Marco Meoli 106
Anastasios Tampakis 95
Giovanni Acerbi 91
David A Balfour 91
Bluskov and Sidorenko 78
Kamal Fadlaoui 64
Bluskov, Milshtein and Sidorenko 56
Flavio Perona 50
Sveta Marjanovic 50
Kleszek 45
Jan de Heer 42
Mathias Liesener 36
Rade Belic 27
Weber Azevedo 26
Bluskov-sidorenko 26
Barnabas Toth 24
Kinski and Genivaldo Pereira 23
Andrei Ochmat 23
Evandro De Simone 20
Chaoying Dai, Ben Li and Michel Toulouse 19
Luciano Rezende 18
Felix Rodriguez Martin 17
Adolf Muehl 14
Rade Belic and Jan de Heer 12
Vinicius Alves 12
Jiang Yong Ming and Jiang Kun Xi 9
Aline Marie Menezes Wanderlei 9
Enzo Franzese 8
Stefano de Martino 8
Jurek 7
Sveta Marjanovic and Anastasios Tampakis 7
Karsten Schlzel 6
777ch 6
Rosario Marino 6
W.h.mills and R.c.mullin 5
Alessandro Jurcovich E Marco Meoli 5
W.h.mills 4
Jan de Heer and Rade Belic 4
Roy Gourgi 4
Jiang Yong Ming 4
Antonio Franzese and Enzo Franzese 3
Tommaso Tanto 3
Iliya Bluskov 2
Claus Friis 2
Bluskov and Hamalainen 2
Guenther Schlegl 2
Sveta Marjanovicandanastasios Tampakis 2
Mario Pina 2
Alessandro Brozzetti 2
Marco Meoli and Franco Atzeni 2
Namyk Kemal Erdogan 1
W. H. Mills 1
Karsten Scholzel 1
Adolf Muehl and Dietmar Pree 1
Igor Lazebnik 1
Tung Le 1
Riccardo Bertolo and Francesco Santisi 1
A. Tampakis and A. Jurchovich 1
Kinsky and Genivaldo Pereira 1
Marco Meoli E Alessandro Jurcovich 1
Jose Milan Vega 1
Dietmar Pree and Adolf Muehl 1
Rade Belic and Dietmar Pree 1
A. Betten, R. Laue and A. Wassermann 1
Dietmar Pree and Rade Belic 1
Alexandre Spaeth 1
Chaoying Dai, Ben Li and Michel Toulouse, Reduced By Rade Belic 1
Daryl Burns 1
Steve Muir 1
Bigmax 1
Carmine Iorio 1
Alessandro Jurcovich E Claudio Tosi 1
Fair_play 1
Anastasios Tampakis and Sveta Marjanovic 1
M. Wang 1
Bluskov-greig-heinrich 1
Dbr58 1
Enzo Franzese E Alessandro Jurcovich 1
A. Jurcovich E G. Acerbi 1
K 1
Bertolo-santisi 1
Giovanni Acerbi and Evandro de Simone 1
David Cushing 1
Michael Kiermaier, Vedran Krčadinac, Alfred Wassermann 1





Overall there have been 104311 entries from 213 different contributors

All-time Contributors






LJCR 57473
A. West 7682
Jan de Heer and Steve Muir 6136
Dietmar Pree 3651
Terenzio Lazzarotto 3266
Enzo Franzese 3000
Michael Dambmann 2254
Tommaso Tanto 1803
JCD Article 1632
Flavio Perona 1539
Rade Belic 1442
Marco Meoli 1316
Alessandro Jurcovich 1131
Franco Atzeni 1034
Kleszek 761
M. Wang 746
Jiang Yong Ming and Jiang Kun Xi 662
Rade Belic and Dragan Stojiljkovic 539
Sveta Marjanovic 500
Stefano de Martino 484
Colin Barker 457
Evandro De Simone 384
Antonio Franzese and Enzo Franzese 371
Anastasios Tampakis 352
Giovanni Acerbi 350
Gerald Unger 343
E. Franzese, A. Jurcovich E M. Meoli 326
Moshe Milshtein 318
777ch 288
Kinski and Genivaldo Pereira 278
Aline Marie Menezes Wanderlei 273
Felix Rodriguez Martin 244
Barnabas Toth 228
Fair_play 225
Jurek 218
Pio Leonardi 194
Steve Muir 131
Jan de Heer 129
Francisco Carlos 127
Weber Azevedo 127
David A Balfour 125
Luciano Rezende 104
Vinicius Alves 95
A. Jurcovich, M. Meoli E E. Franzese 91
Kamal Fadlaoui 89
Bluskov and Sidorenko 88
Jiang Yong Ming 85
Bluskov-sidorenko 82
Bluskov, Milshtein and Sidorenko 60
Alessandro Jurcovich E Marco Meoli 57
Nino Aspesi 54
Mathias Liesener 51
Dietmar Pree and Rade Belic 41
Jose Milan Vega 40
Chaoying Dai, Ben Li and Michel Toulouse 39
Jaera 38
Rade Belic and Jan de Heer 38
Enzo Franzese E Alessandro Jurcovich 37
Andrei Ochmat 31
Gino Grazin and Rade Belic 31
Marco Meoli E Alessandro Jurcovich 29
Alessandro Jurcovich E Enzo Franzese 28
Marco Meoli-alessandro Jurcovich-enzo Franzese 28
Dragan Stojiljkovic 27
Enzo Franzese E Marco Meoli 26
Antonio Franzese 20
Jan de Heer and Rade Belic 19
Adolf Muehl 17
Sveta Marjanovic and Anastasios Tampakis 17
A. Jurcovich, E. Franzese E M. Meoli 17
Roy Gourgi 14
Weberazevedo 13
Jinyuan Wang 13
Tarullig 12
Flavio.perona 11
Kabila 11
Igor Lazebnik 10
Alternatywa 10
Iliya Bluskov 9
Sildemar Castro 8
Marco Meoli and Alessandro Jurcovich 8
Marco Meoli-alessandro Jurcovich 8
Claudio Tosi 8
Rosario Marino 8
Riccardo Bertolo 7
Daryl Burns 7
Enzo Franzese E Dietmar Pree 7
Mario Pina 6
Karsten Schlzel 6
Hillary 6
Bluskov, Sidorenko 6
W.h.mills and R.c.mullin 5
Enzo Franzese E Weber Azevedo 5
Anastasios Tampakis and Sveta Marjanovic 5
Riccardo Bertolo and Francesco Santisi 4
Ivan Baptiste and Rade Belic 4
Rade Belic and Dietmar Pree 4
Leopio 4
W.h.mills 4
Sveta Marjanovicandanastasios Tampakis 4
Enzo Franzese E Nino Aspesi 4
Fctv 4
K 4
Alessandro Brozzetti 4
Claus Friis 3
Michael Damb 3
Marco Meoli Alessandro Jurcovich 3
Alessandro Jurcovich E Stefano de Martino 3
Marco Meoli E Enzo Franzese 3
Enzo Franzese E Michael Dambmann 3
Giovanni Acerbi and Terenzio Lazzarotto 3
Marco Marco 3
Alessandro Jurcovich E Free 3
Ok 3
Riccardo Bertolo and Jan de Heer 2
Genivaldo Pereira 2
Ricardo Ramalho 2
Paolo Ferlaino 2
Bluskov and Hamalainen 2
Adolf Muehl and Dietmar Pree 2
Karsten Scholzel 2
Meoli Marco 2
Tarullig / Aspesi 2
Alessandro Jurcovich - Nino Aspesi 2
Marco Meoli E Dietmar Pree 2
Weber Azevedo E Enzo Franzese 2
Enzo Franzese E Terenzio Lazzarotto 2
Enzo Franzese E Prize 2
Alessandro Jurcovich-marco Meoli-enzo Franzese 2
Spada Mauro 2
Alessandro Jurcovich E Claudio Tosi 2
Alessandro Jurcovich E Giovanni Acerbi 2
Covboy 2
Bertolo-santisi 2
Marco Meoli and Franco Atzeni 2
A. Betten, R. Laue and A. Wassermann 1
Namyk Kemal Erdogan 1
Alexandre Spaeth 1
Fernando Villanova 1
Steve Muir, Improving One By Jan de Heer 1
Chaoying Dai, Ben Li and Michel Toulouse, Reduced By Rade Belic 1
Jose Maria Milan 1
Grzesiek 1
Jan de Heer With Ininuga By Uros Boltin 1
Peter Rosendahl 1
Daniel Morais 1
Adolf Muehl and Rade Belic And Dietmar Pree 1
Lazzarotto Terenzio 1
Kinsky and Genivaldo Pereira 1
Gerasorte Online 1
W. H. Mills 1
Leo Pio 1
Qlatino 1
Simple Construction: Doubled (50,6,2) and Deleted An Element 1
Simple Construction: Doubled (50,8,2) and Deleted An Element 1
Simple Construction: Doubled (50,10,2) and Deleted An Element 1
Simple Construction: Doubled (50,11,2) and Deleted An Element 1
Simple Construction: Doubled (50,8,3) and Deleted An Element 1
Simple Construction: Doubled (50,9,3) and Deleted An Element 1
Simple Construction: Doubled (50,10,3) and Deleted An Element 1
Simple Construction: Doubled (50,11,3) and Deleted An Element 1
Simple Construction: Doubled (50,10,4) and Deleted An Element 1
42066 1
Quadrupling Construction 1
Altopalato Bellariva 1
Aspesi - Paramini - Tosi 1
Aspesi - Paramini - Marjanovic 1
Nino Aspesi - Moreno Paramini 1
Paramini and Kabila and Aspesi 1
Tung Le 1
Marjanovic Jurcovich Aspesi 1
Marco Meoli Sveta Marjanovic 1
A. Tampakis and A. Jurchovich 1
Nino Aspesi - Alessandro Jurcovich 1
Edi8 1
Tarullig/aspesi 1
Mario Tessuto 1
Alessandro Jurcovich-sveta Marjanovic-marco Meoli 1
J 1
Nino Aspesi E Enzo Franzese 1
Spada Mauro Bellariva 1
Marco Meoli - Alessandro Jurcovich - Enzo Franzese 1
A. Jurcovich, M. Meoli E E. Franzese E M. Meoli 1
Ricardo Sepulveda and Anastasios Tampakis 1
Bigmax 1
Kl 1
M. Meoli, A. Jurcovich E E. Franzese 1
Alessandro Jurcovich Marco Meoli Enzo Franzese 1
Enzo Franzese E Flavio Perona 1
Carmine Iorio 1
Dolce Remi 1
Bellariva 1
Tarullig and Kabila 1
Kair_play 1
Play_fair 1
A. Jurcovich, G. Acerbi E M. Meoli 1
Giovanni Acerbi and Alessandro Jurcovich 1
Aline Marie Menezes Wanderlei and Evandro De Simone 1
Don Backi 1
Paramini Moreno 1
Arrastre 1
Weber Azevedoandaline Marie 1
Socmel 1° 1
Altetnatywa 1
Spada Mauro 2202 1
Bluskov-greig-heinrich 1
Dbr58 1
A. Jurcovich, M. Meoli E G. Acerbi 1
A. Jurcovich E G. Acerbi 1
Giovanni Acerbi and Evandro de Simone 1
David Cushing 1
Franco Atzeni and Giovanni Acerbi 1
Michael Kiermaier, Vedran Krčadinac, Alfred Wassermann 1

Methods used in current tables

Local search 3369
unknown1032
Private tools 812
Simple construction 771
Multiple 535
Dynamic programming construction 467
Lex covering 258
Constructed 226
Dynamic programming covering 131
Wheel generator v2 126
Wheeling systems checker 5 121
Tabu search started 117
Simulated annealing 110
Union optimization 85
Simple construction: multiple 70
Simple construction: induced 61
Simple construction: combined 59
Wheel generator 59
Lexicographic greedy covering 57
Dynamic construction 53
Using wsc_5 52
Product construction 45
Local search - bluskov pdo technique 36
Private tool 35
Simple construction: deleted element 31
Using wsc5 27
Dynamic programming 26
Random greedy covering 23
Tabu search 22
Cyclic covering found by search program 21
Cyclic covering 18
Simple construction: added element to c(v-1,k-1,t) covering 17
Steiner quadruple system 16
Wheeling systems checker 4 15
Jymccdd programming 13
Multi-stage optimization 12
Constructed using simulated annealing 11
Sidorenko construction 11
Cyclic construction 10
Simple combine 10
Design is based on c (v - 1, k, t) = b - v 10
Cyclic covering found by a search program 9
See paper by jrj abel et al. in discrete mathematics 307 (2007) 9
Simulated annealing covering 9
Group orbit covering design 9
Shortened covering 9
Nurmela and ostergard simulated annealing cover 8
Affine geometry covering 7
Simple optimization 7
Wsc 4 + wg 2.3 7
Wsc_5 7
Wsc5 7
Extended covering 7
Induced 6
Exhaustive search 6
Covering provided by rade belic 6
Wsc4 6
Component construction 6
Steiner triple system 5
See jct series a 49, 308-322 (1988) 5
Nurmela-ostergard symmetric covering 5
Sidorenko method 5
Based on work by iliya bluskov 5
See journal 4
Constructed using difference families 4
Simple construction: added element to c(v,k-1,t) covering 4
Cyclic symmetry 4
Hanani construction (see canadian journal 4
Extraction/remainder 4
Nurmela-ostergard simulated annealing covering design 4
Wo - otimizador de rodas 4
Wsc v4 4
Chain rule 4
Different methods (mainly simulated annealing) 4
Colex greedy covering 3
Mills, jcta 13 (1972) pp. 55-78. 3
Found by a hill-climbing program 3
Steiner system 3
Covering found by a hill-climbing program 3
Cyclic steiner system 3
Projective plane 3
Mills, ars combinatoria, 8 (1979) pg. 247 3
Mills, ars combinatoria, 8 (1979) pg. 231 3
Mills, ars combinatoria 8 (1979) pp. 199-315 3
Reverse engineering smaller systems 3
Using ininuga, by uros boltin 3
Covering provided by alex sidorenko (personal communication) 3
Lottocp systems generator 3
Refinements 3
Covering pairs by quads: mills, jcta 15:138-166, 1973. 2
Constructed using difference sets 2
Constructed by simulated annealing 2
Constructed using dynamic programming 2
Communicated by d. todorov, using pg(2,3) 2
Communicated by d. todorov, using pg(2,4) 2
Affine plane 2
Steiner system (derived) 2
Covering provided by john cock (personal communication) 2
Jcd 1998, pp. 21-41 2
Nurmela-ostergard simulated annealing covering 2
Hill-climb on affine orbits 2
Hill-climb on cyclic orbits 2
Simple method construction 2
Wheeling systems checker 2
Wsc 5 2
Optimization 2
Improvement 2
From 1-flat on 42 numbers 1
Mill, jcta 15 (1973) 138-166 1
See paper in journal 1
Cyclic 1
Td(4,12) & 4 * c(15,4,2) 1
Td(4,15) and 4 * modified c(18,4,2) 1
Using rc(45,3,2) 1
Using a (v,4,22*)-pbd and c(22,4,2) 1
Td(4,18) + 4 * c(21,4,2) 1
Td(4,19) & 4 * c(21,4,2) 1
Using rc(54,3,2) 1
Using rc(60,3,2) by lamken and mills (1993) 1
Td(4,23) + 4 * c(25,4,2) 1
Td(4,24) + 4 * c(26,4,2) 1
Td(4,24) + 4*c(27,4,2) 1
Covering pairs by quints, mills & mullin, jcta 49:308-322, 1988 1
Covering pairs by quints, mullin, jcmcc 2:133-146, 1987 1
Cyclic covering on z5*z7 1
Cyclic covering on z3*z17 with one point at infinity 1
Using a 4−gdd 1
Using resolvable c(68,4,2), see lamken, mullen and rees (jcd, 1997-1) 1
Using resolvable c(72,4,2), see lamken, mullen and rees (jcd, 1997-1) 1
Covering found by john rawson 1
Produced with covermaster (by john rawson), wheelgenerator (by anastasios tampakis) and private tools. 1
See j comb des , vol. 15, no. 6, pp. 511-533, 2007 1
Using td(6,15) and 6*modified c(18,6,2,2) 1
Using td(6,16) and 6*modified c(18,6,2,2) 1
Communicated by d. todorov 1
Using a resolvable c(54,6,2,2) 1
From td(7,12) and 7*c(13,7,2,2,5) with 2 holes 1
From td(7,12) and 7*c(15,7,2,2,6) with 3 holes 1
Td(7,13) and 7 * modified c(15,7,2) 1
From 57,8,2 1
From td(9,9) and 9*c(14,9,2,2,3) with 5 holes 1
Mills, ars combinatoria, 8 (1979) pg. 254 1
Mills, ars combinatoria, 8 (1979) pg. 270 1
Doubling resolvable c(25,5,2) 1
Tripling a resolvable c(25,5,2) 1
Steiner system, taken 1
Doubling c(18,4,3) 1
Reverse engineering 1
Simple construction: 1
Doubling c(30,4,3) 1
See w h mills in congressus numerantium 10 (1974) pp563-581 1
Doubling c(36,4,3) 1
Doubling c(42,4,3) 1
Covering produced by floyd l. oats, using a ranking and reduction process 1
Wheel generator, based on jan de heer and steve muir work 1
Group theory 1
Covering 1
Quadrupling construction 1
Covering provided by konstantin katskov, found by exhaustive search 1
Private tools - assisted by wheel generator 1
Cyclic symmetrical 1
Combinado 1
Ex 8 1
Covering found by rade belic 1
Marco meoli 1
Superfluous-element hill climb on a covering 1
Ininuga (by uros boltin) 1
Ex 16 1
Ex 13 1
Ex 15 1
See designs, codes and cryptography 17 (1999), 181-186 1
Covering provided by dietmar pree 1
Method 1
Based on work by chaoying dai, ben li and michel toulouse 1
Block-array construction (gordon, patashnik, petro and taylor) 1
Ex 28 1
Superfluous-element hill climb on a random greedy covering 1
Block covering 1
Ex 54 1
Chain rule (64,32,6)x(32,24,6) 1
Several methods (including sa) 1
Normal methods 1
Quadrupling a full c(10,5,5) 1
Unusual methods 1
Construction combined 1
Wheel generator, based on chaoying dai, ben li and michel toulouse work 1
Based on work by kleszek 1
Wheel generator and covermaster 1
Korelacje_777ch__fairplay_v4 1
Simple construction: doubled (50,8,2) and deleted an element 1
Simple construction: doubled (50,10,2) and deleted an element 1
Simple construction: doubled (50,8,3) and deleted an element 1
Wheel generator and private tools 1
Wheel generator, covermaster and wo - otimizador de rodas 1
Wheeling systems checker, wheel generator and ininuga 1
Private tools, covermaster and wheelgenerator 1
Wang construction 1
Personale 1
From the article infinite classes 1
Using wheel generator 1
Wheeling systems checkers 5 1
Product type construction, based on nine (10,4,3) coverings whose union is a (10,4,4) covering 1
4 mols 1
Intelligent design 1
Product construction, improving on a jurcovich and meoli covering 1
Product construction, improving on a pree covering 1
Personal 1
Sum 1
Component optimization 1
Extend steiner 2-designs by prescribing automorphisms and reducing the problem to an exact cover problem 1