The tables currently have 9236 entries from 89 different contributors


last updated at 2022-09-28 14:00:08

Top Contributors

LJCR 3090
Jan de Heer and Steve Muir 2180
Dietmar Pree 964
A. West 564
Colin Barker 316
Terenzio Lazzarotto 305
Marco Meoli 277
Alessandro Jurcovich 257
Michael Dambmann 173
Stefano de Martino 149
Anastasios Tampakis 102
Kamal Fadlaoui 73
Evandro De Simone 70
Flavio Perona 61
777ch 53
Jan de Heer 42
Sveta Marjanovic 39
Kleszek 38
Enzo Franzese 38
Mathias Liesener 34
Rade Belic 29
Jiang Yong Ming and Jiang Kun Xi 29
Fair_play 27
Barnabas Toth 25
Kinski and Genivaldo Pereira 25
Andrei Ochmat 23
Chaoying Dai, Ben Li and Michel Toulouse 21
Felix Rodriguez Martin 18
Luciano Rezende 18
Jiang Yong Ming 17
M. Wang 17
Adolf Muehl 14
Giovanni Acerbi 14
Rade Belic and Jan de Heer 12
Vinicius Alves 12
Aline Marie Menezes Wanderlei 12
Alessandro Jurcovich E Marco Meoli 8
Karsten Schlzel 6
W.h.mills and R.c.mullin 5
Roy Gourgi 5
W.h.mills 4
Jan de Heer and Rade Belic 4
Weber Azevedo 4
Marco Meoli E Alessandro Jurcovich 3
E. Franzese, A. Jurcovich E M. Meoli 3
Alternatywa 3
Enzo Franzese E Alessandro Jurcovich 3
Iliya Bluskov 2
Claus Friis 2
Bluskov and Hamalainen 2
Guenther Schlegl 2
Sveta Marjanovicandanastasios Tampakis 2
Daryl Burns 2
Mario Pina 2
Marco Meoli and Alessandro Jurcovich 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
Alessandro Brozzetti 1
Moshe Milshtein 1
Spada Mauro 2202 1
Bluskov-greig-heinrich 1
Dbr58 1
Marco Meoli E Enzo Franzese 1
Enzo Franzese E Marco Meoli 1





Overall there have been 86261 entries from 194 different contributors

All-time Contributors






LJCR 52796
Jan de Heer and Steve Muir 6136
Enzo Franzese 3000
Michael Dambmann 2254
Terenzio Lazzarotto 2229
Dietmar Pree 2032
Tommaso Tanto 1799
A. West 1763
JCD Article 1632
Flavio Perona 1539
Rade Belic 1441
Marco Meoli 922
Alessandro Jurcovich 710
Jiang Yong Ming and Jiang Kun Xi 629
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
Sveta Marjanovic 287
Evandro De Simone 286
Kinski and Genivaldo Pereira 278
Aline Marie Menezes Wanderlei 263
Felix Rodriguez Martin 244
Barnabas Toth 228
Fair_play 225
777ch 196
Pio Leonardi 194
M. Wang 166
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
Alessandro Jurcovich E Marco Meoli 57
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
Enzo Franzese E Alessandro Jurcovich 37
Weber Azevedo 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 27
Enzo Franzese E Marco Meoli 26
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 and Alessandro Jurcovich 8
Marco Meoli-alessandro Jurcovich 8
Claudio Tosi 8
Riccardo Bertolo 7
Daryl Burns 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
Marco Meoli E Enzo Franzese 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 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
Alessandro Brozzetti 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
Spada Mauro 2202 1
Bluskov-greig-heinrich 1
Dbr58 1

Methods used in current tables

Private tools 2028
Local search 1429
unknown1416
Simple construction 866
Dynamic programming construction 762
Multiple 606
Lex covering 258
Constructed 226
Private tool 175
Dynamic programming covering 132
Simulated annealing 115
Wheeling systems checker 4 84
Simple construction: multiple 70
Wheel generator 68
Simple construction: induced 62
Simple construction: combined 61
Lexicographic greedy covering 57
Jymccdd programming 46
Dynamic construction 43
Dynamic programming 37
Korelacje_777ch__fairplay_v4 37
Local search - bluskov pdo technique 37
Simple construction: deleted element 31
Tabu search 27
Korelacje_777ch v5 25
Wsc v4 24
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
Wang construction 17
Steiner quadruple system 16
Sidorenko 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
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
Affine geometry covering 7
Nurmela-ostergard symmetric covering 7
Induced 6
Exhaustive search 6
Covering provided by rade belic 6
Wo - otimizador de rodas 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
Shortened covering 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
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
Wheeling systems checker 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
Extended covering 1
Based on work by a. tampakis 1
Wheeling systems checker, wheel generator and ininuga 1
Private tools, covermaster and wheelgenerator 1
Personale 1
From the article infinite classes 1