The tables currently have 9228 entries from 86 different contributors


last updated at 2022-05-12 18:03:50

Top Contributors

LJCR 3057
Jan de Heer and Steve Muir 2242
Dietmar Pree 877
A. West 677
Terenzio Lazzarotto 326
Colin Barker 316
Alessandro Jurcovich 214
Marco Meoli 198
Stefano de Martino 196
Michael Dambmann 173
Anastasios Tampakis 102
Evandro De Simone 77
Kamal Fadlaoui 73
Flavio Perona 61
Sveta Marjanovic 43
Jan de Heer 42
Kleszek 41
777ch 38
Mathias Liesener 34
Jiang Yong Ming and Jiang Kun Xi 34
Rade Belic 29
Fair_play 27
Barnabas Toth 25
Kinski and Genivaldo Pereira 25
Andrei Ochmat 23
Enzo Franzese 23
Chaoying Dai, Ben Li and Michel Toulouse 21
Felix Rodriguez Martin 18
Luciano Rezende 18
Giovanni Acerbi 18
Jiang Yong Ming 17
M. Wang 16
Aline Marie Menezes Wanderlei 15
Adolf Muehl 14
Rade Belic and Jan de Heer 12
Vinicius Alves 12
Alessandro Jurcovich E Marco Meoli 8
Karsten Schlzel 6
W.h.mills and R.c.mullin 5
Roy Gourgi 5
Weber Azevedo 5
W.h.mills 4
Jan de Heer and Rade Belic 4
Alternatywa 4
Marco Meoli E Alessandro Jurcovich 3
E. Franzese, A. Jurcovich E M. Meoli 3
Iliya Bluskov 2
Claus Friis 2
Bluskov and Hamalainen 2
Guenther Schlegl 2
Sveta Marjanovicandanastasios Tampakis 2
Daryl Burns 2
Mario Pina 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
Jaera 1
Kinsky and Genivaldo Pereira 1
Jose Milan Vega 1
Dietmar Pree and Adolf Muehl 1
Rade Belic and Dragan Stojiljkovic 1
Rade Belic and Dietmar Pree 1
A. Betten, R. Laue and A. Wassermann 1
Riccardo Bertolo and Jan de Heer 1
Dietmar Pree and Rade Belic 1
Alexandre Spaeth 1
Chaoying Dai, Ben Li and Michel Toulouse, Reduced By Rade Belic 1
Steve Muir 1
Marco Meoli-alessandro Jurcovich-enzo Franzese 1
Bigmax 1
Carmine Iorio 1
Marco Meoli-alessandro Jurcovich 1
Alessandro Jurcovich E Claudio Tosi 1
Tarullig 1
Anastasios Tampakis and Sveta Marjanovic 1
Claudio Tosi 1
Alessandro Brozzetti 1
Moshe Milshtein 1
Spada Mauro 2202 1
Bluskov-greig-heinrich 1
Marco Meoli and Alessandro Jurcovich 1





Overall there have been 85302 entries from 193 different contributors

All-time Contributors






LJCR 52538
Jan de Heer and Steve Muir 6136
Enzo Franzese 2870
Michael Dambmann 2254
Terenzio Lazzarotto 2184
Dietmar Pree 1870
Tommaso Tanto 1799
A. West 1763
JCD Article 1632
Flavio Perona 1537
Rade Belic 1441
Marco Meoli 798
Alessandro Jurcovich 642
Jiang Yong Ming and Jiang Kun Xi 611
Rade Belic and Dragan Stojiljkovic 539
Kleszek 530
Stefano de Martino 479
Colin Barker 457
Anastasios Tampakis 344
Gerald Unger 343
E. Franzese, A. Jurcovich E M. Meoli 326
Evandro De Simone 283
Kinski and Genivaldo Pereira 278
Sveta Marjanovic 277
Aline Marie Menezes Wanderlei 263
Felix Rodriguez Martin 244
Barnabas Toth 228
Fair_play 225
Pio Leonardi 194
777ch 165
Steve Muir 131
Jan de Heer 129
Francisco Carlos 127
Luciano Rezende 100
Vinicius Alves 95
Giovanni Acerbi 94
A. Jurcovich, M. Meoli E E. Franzese 91
Kamal Fadlaoui 89
Jiang Yong Ming 85
M. Wang 69
Alessandro Jurcovich E Marco Meoli 56
Nino Aspesi 54
Mathias Liesener 47
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
Weber Azevedo 34
Enzo Franzese E Alessandro Jurcovich 34
Andrei Ochmat 31
Gino Grazin and Rade Belic 31
Marco Meoli E Alessandro Jurcovich 29
Marco Meoli-alessandro Jurcovich-enzo Franzese 28
Dragan Stojiljkovic 27
Alessandro Jurcovich E Enzo Franzese 26
Enzo Franzese E Marco Meoli 24
Antonio Franzese 20
Jan de Heer and Rade Belic 19
Adolf Muehl 17
A. Jurcovich, E. Franzese E M. Meoli 17
Roy Gourgi 14
Weberazevedo 13
Flavio.perona 11
Kabila 11
Tarullig 11
Igor Lazebnik 10
Alternatywa 10
Iliya Bluskov 9
Sildemar Castro 8
Marco Meoli-alessandro Jurcovich 8
Claudio Tosi 8
Riccardo Bertolo 7
Daryl Burns 7
Marco Meoli and Alessandro Jurcovich 7
Enzo Franzese E Dietmar Pree 7
Mario Pina 6
Karsten Schlzel 6
Sveta Marjanovic and Anastasios Tampakis 6
Hillary 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
Claus Friis 3
Michael Damb 3
Marco Meoli Alessandro Jurcovich 3
Alessandro Jurcovich E Stefano de Martino 3
Enzo Franzese E Michael Dambmann 3
K 3
Giovanni Acerbi and Terenzio Lazzarotto 3
Alessandro Jurcovich E Free 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 Enzo Franzese 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
Marco Marco 2
Covboy 2
Moshe Milshtein 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
Alessandro Brozzetti 1
Spada Mauro 2202 1
Bluskov-greig-heinrich 1

Methods used in current tables

Private tools 2075
Local search 1451
unknown1312
Simple construction 868
Dynamic programming construction 705
Multiple 606
Lex covering 258
Constructed 226
Private tool 222
Dynamic programming covering 132
Simulated annealing 115
Wheeling systems checker 4 95
Simple construction: combined 84
Simple construction: multiple 70
Wheel generator 68
Simple construction: induced 62
Lexicographic greedy covering 57
Jymccdd programming 50
Dynamic construction 43
Local search - bluskov pdo technique 39
Dynamic programming 37
Korelacje_777ch__fairplay_v4 37
Simple construction: deleted element 31
Tabu search 27
Wsc v4 27
Random greedy covering 23
Cyclic covering found by search program 20
Cyclic covering 18
Simple construction: added element to c(v-1,k-1,t) covering 18
Steiner quadruple system 16
Sidorenko construction 16
Wang construction 16
Simple optimization 15
Wheel generator v2 13
Constructed using simulated annealing 11
Cyclic construction 10
Simple combine 10
Design is based on c (v - 1, k, t) = b - v 10
Korelacje_777ch v5 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
Nurmela and ostergard simulated annealing cover 8
Wo - otimizador de rodas 8
Affine geometry covering 7
Nurmela-ostergard symmetric covering 7
Induced 6
Exhaustive search 6
Covering provided by rade belic 6
Shortened covering 6
Steiner triple system 5
See jct series a 49, 308-322 (1988) 5
Extraction/remainder 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
Nurmela-ostergard simulated annealing covering design 4
Using wsc4 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
Covering provided by alex sidorenko (personal communication) 3
Using ininuga, by uros boltin 3
Wheeling systems checker 3
777ch software + wsc v4 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
Wheel generator, based on jan de heer and steve muir work 2
Covering provided by john cock (personal communication) 2
Several methods (including sa) 2
Jcd 1998, pp. 21-41 2
Nurmela-ostergard simulated annealing covering 2
Hill-climb on affine orbits 2
Covering provided by dietmar pree 2
Hill-climb on cyclic orbits 2
Simple method construction 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
Group theory 1
Covering 1
Privat tools 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
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
Ex 1988 1
Superfluous-element hill climb on a random greedy covering 1
Block covering 1
Ex 54 1
Ex 62 1
Chain rule (64,32,6)x(32,24,6) 1
Normal methods 1
Quadrupling a full c(10,5,5) 1
Replicate 4 columns 1
Unusual methods 1
Construction combined 1
Of,24,15,7,165 1
Of,28,10,6,2899 1
Ininuga 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__farplay_v1 1
Korelacje_777ch__fairplay_v2 1
Wsc program 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
Wheel generator and private tools 1
Wheel generator, covermaster and wo - otimizador de rodas 1
Using wheel generator 1
Extended covering 1
Based on work by a. tampakis 1
Wheeling systems checker, wheel generator and ininuga 1
Private tools, covermaster and wheelgenerator 1
Personal climbing method 1
Personale 1
From the article infinite classes 1
Jymccdd program 1