The tables currently have 9128 entries from 87 different contributors


last updated at 2020-10-28 09:08:08

Top Contributors

LJCR 3688
Jan de Heer and Steve Muir 2750
Colin Barker 321
Dietmar Pree 303
Enzo Franzese 250
Michael Dambmann 184
Marco Meoli 164
Stefano de Martino 160
Terenzio Lazzarotto 158
Fair_play 118
Anastasios Tampakis 107
Kleszek 105
Alessandro Jurcovich 96
Kamal Fadlaoui 73
Flavio Perona 59
Jan de Heer 45
Sveta Marjanovic 41
777ch 38
Mathias Liesener 34
Rade Belic 29
Kinski and Genivaldo Pereira 25
Barnabas Toth 25
Andrei Ochmat 23
Giovanni Acerbi 21
Chaoying Dai, Ben Li and Michel Toulouse 21
Aline Marie Menezes Wanderlei 21
Tommaso Tanto 20
Evandro De Simone 20
Luciano Rezende 18
Felix Rodriguez Martin 18
Jiang Yong Ming 17
E. Franzese, A. Jurcovich E M. Meoli 17
Jiang Yong Ming and Jiang Kun Xi 16
Vinicius Alves 13
Adolf Muehl 13
Rade Belic and Jan de Heer 12
Pio Leonardi 7
Alessandro Jurcovich E Marco Meoli 7
Karsten Schölzel 6
W.h.mills and R.c.mullin 5
Roy Gourgi 5
Weber Azevedo 4
W.h.mills 4
Rade Belic and Dragan Stojiljkovic 4
Marco Meoli E Alessandro Jurcovich 4
Jan de Heer and Rade Belic 4
Daryl Burns 3
A. Jurcovich, M. Meoli E E. Franzese 3
Tarullig 2
Sveta Marjanovicandanastasios Tampakis 2
Steve Muir 2
Mario Pina 2
Iliya Bluskov 2
Guenther Schlegl 2
Gerald Unger 2
Claus Friis 2
Bluskov and Hamalainen 2
Anastasios Tampakis and Sveta Marjanovic 2
Weber Azevedo E Enzo Franzese 1
W. H. Mills 1
Tung Le 1
Riccardo Bertolo and Jan de Heer 1
Riccardo Bertolo and Francesco Santisi 1
Rade Belic and Dietmar Pree 1
Namyk Kemal Erdogan 1
Marco Meoli-alessandro Jurcovich-enzo Franzese 1
Marco Meoli-alessandro Jurcovich 1
Kinsky and Genivaldo Pereira 1
Karsten Scholzel 1
Jose Milan Vega 1
Jaera 1
Igor Lazebnik 1
Giovanni Acerbi and Terenzio Lazzarotto 1
Giovanni Acerbi and Alessandro Jurcovich 1
Enzo Franzese E Terenzio Lazzarotto 1
Enzo Franzese E Flavio Perona 1
Dietmar Pree and Rade Belic 1
Dietmar Pree and Adolf Muehl 1
Chaoying Dai, Ben Li and Michel Toulouse, Reduced By Rade Belic 1
Carmine Iorio 1
Bigmax 1
Alexandre Spaeth 1
Alessandro Jurcovich E Giovanni Acerbi 1
Alessandro Jurcovich E Claudio Tosi 1
Adolf Muehl and Dietmar Pree 1
A. Tampakis and A. Jurchovich 1
A. Betten, R. Laue and A. Wassermann 1





Overall there have been 78115 entries from 177 different contributors

All-time Contributors






LJCR 50918
Jan de Heer and Steve Muir 6136
Enzo Franzese 2423
Michael Dambmann 2254
Tommaso Tanto 1799
Terenzio Lazzarotto 1784
JCD Article 1632
Flavio Perona 1532
Rade Belic 1441
Dietmar Pree 602
Rade Belic and Dragan Stojiljkovic 539
Jiang Yong Ming and Jiang Kun Xi 494
Colin Barker 457
Marco Meoli 451
Alessandro Jurcovich 386
Kleszek 359
Gerald Unger 343
E. Franzese, A. Jurcovich E M. Meoli 326
Anastasios Tampakis 323
Kinski and Genivaldo Pereira 278
Felix Rodriguez Martin 244
Aline Marie Menezes Wanderlei 244
Stefano de Martino 236
Sveta Marjanovic 228
Barnabas Toth 228
Fair_play 225
Pio Leonardi 194
Steve Muir 131
Jan de Heer 129
Francisco Carlos 127
777ch 122
Luciano Rezende 100
Vinicius Alves 91
A. Jurcovich, M. Meoli E E. Franzese 91
Kamal Fadlaoui 89
Jiang Yong Ming 85
Giovanni Acerbi 70
Alessandro Jurcovich E Marco Meoli 55
Nino Aspesi 54
Mathias Liesener 47
Dietmar Pree and Rade Belic 41
Jose Milan Vega 40
Chaoying Dai, Ben Li and Michel Toulouse 39
Rade Belic and Jan de Heer 38
Jaera 38
Evandro De Simone 34
Enzo Franzese E Alessandro Jurcovich 34
Gino Grazin and Rade Belic 31
Andrei Ochmat 31
Marco Meoli-alessandro Jurcovich-enzo Franzese 28
Marco Meoli E Alessandro Jurcovich 27
Dragan Stojiljkovic 27
Alessandro Jurcovich E Enzo Franzese 26
Enzo Franzese E Marco Meoli 24
Weber Azevedo 22
Antonio Franzese 20
Jan de Heer and Rade Belic 19
A. Jurcovich, E. Franzese E M. Meoli 17
Roy Gourgi 14
Weberazevedo 13
Kabila 11
Flavio.perona 11
Tarullig 10
Igor Lazebnik 10
Sildemar Castro 8
Marco Meoli-alessandro Jurcovich 8
Adolf Muehl 8
Riccardo Bertolo 7
Enzo Franzese E Dietmar Pree 7
Daryl Burns 7
Sveta Marjanovic and Anastasios Tampakis 6
Mario Pina 6
Karsten Schölzel 6
Hillary 6
W.h.mills and R.c.mullin 5
Enzo Franzese E Weber Azevedo 5
Anastasios Tampakis and Sveta Marjanovic 5
W.h.mills 4
Sveta Marjanovicandanastasios Tampakis 4
Riccardo Bertolo and Francesco Santisi 4
Rade Belic and Dietmar Pree 4
Leopio 4
Ivan Baptiste and Rade Belic 4
Fctv 4
Enzo Franzese E Nino Aspesi 4
Michael Damb 3
Marco Meoli and Alessandro Jurcovich 3
Marco Meoli Alessandro Jurcovich 3
K 3
Giovanni Acerbi and Terenzio Lazzarotto 3
Enzo Franzese E Michael Dambmann 3
Claus Friis 3
Alessandro Jurcovich E Stefano de Martino 3
Weber Azevedo E Enzo Franzese 2
Tarullig / Aspesi 2
Spada Mauro 2
Riccardo Bertolo and Jan de Heer 2
Ricardo Ramalho 2
Paolo Ferlaino 2
Meoli Marco 2
Marco Meoli E Enzo Franzese 2
Marco Meoli E Dietmar Pree 2
Karsten Scholzel 2
Iliya Bluskov 2
Genivaldo Pereira 2
Enzo Franzese E Terenzio Lazzarotto 2
Enzo Franzese E Prize 2
Bluskov and Hamalainen 2
Alessandro Jurcovich-marco Meoli-enzo Franzese 2
Alessandro Jurcovich E Giovanni Acerbi 2
Alessandro Jurcovich - Nino Aspesi 2
Adolf Muehl and Dietmar Pree 2
W. H. Mills 1
Tung Le 1
Tarullig/aspesi 1
Tarullig and Kabila 1
Steve Muir, Improving One By Jan de Heer 1
Spada Mauro Bellariva 1
Simple Construction: Doubled (50,9,3) and Deleted An Element 1
Simple Construction: Doubled (50,8,3) and Deleted An Element 1
Simple Construction: Doubled (50,8,2) and Deleted An Element 1
Simple Construction: Doubled (50,6,2) and Deleted An Element 1
Simple Construction: Doubled (50,11,3) and Deleted An Element 1
Simple Construction: Doubled (50,11,2) and Deleted An Element 1
Simple Construction: Doubled (50,10,4) and Deleted An Element 1
Simple Construction: Doubled (50,10,3) and Deleted An Element 1
Simple Construction: Doubled (50,10,2) and Deleted An Element 1
Ricardo Sepulveda and Anastasios Tampakis 1
Quadrupling Construction 1
Qlatino 1
Play_fair 1
Peter Rosendahl 1
Paramini and Kabila and Aspesi 1
Nino Aspesi E Enzo Franzese 1
Nino Aspesi - Moreno Paramini 1
Nino Aspesi - Alessandro Jurcovich 1
Namyk Kemal Erdogan 1
Marjanovic Jurcovich Aspesi 1
Mario Tessuto 1
Marco Meoli Sveta Marjanovic 1
Marco Meoli - Alessandro Jurcovich - Enzo Franzese 1
Marco Marco 1
M. Meoli, A. Jurcovich E E. Franzese 1
Leo Pio 1
Lazzarotto Terenzio 1
Kl 1
Kinsky and Genivaldo Pereira 1
Kair_play 1
Jose Maria Milan 1
Jan de Heer With Ininuga By Uros Boltin 1
J 1
Grzesiek 1
Giovanni Acerbi and Alessandro Jurcovich 1
Gerasorte Online 1
Fernando Villanova 1
Enzo Franzese E Flavio Perona 1
Edi8 1
Dolce Remi 1
Daniel Morais 1
Claudio Tosi 1
Chaoying Dai, Ben Li and Michel Toulouse, Reduced By Rade Belic 1
Carmine Iorio 1
Bigmax 1
Bellariva 1
Aspesi - Paramini - Tosi 1
Aspesi - Paramini - Marjanovic 1
Altopalato Bellariva 1
Alexandre Spaeth 1
Alessandro Jurcovich-sveta Marjanovic-marco Meoli 1
Alessandro Jurcovich Marco Meoli Enzo Franzese 1
Alessandro Jurcovich E Claudio Tosi 1
Adolf Muehl and Rade Belic And Dietmar Pree 1
A. Tampakis and A. Jurchovich 1
A. Jurcovich, M. Meoli E E. Franzese E M. Meoli 1
A. Jurcovich, G. Acerbi E M. Meoli 1
A. Betten, R. Laue and A. Wassermann 1
42066 1

Methods used in current tables

Private tools 2709
Dynamic programming construction 1322
unknown1198
Simple construction 883
Multiple 612
Lex covering 258
Local search 235
Constructed 223
Private tool 185
Wsc v4 144
Dynamic programming covering 132
Simulated annealing 127
Korelacje_777ch__fairplay_v4 82
Wheel generator 74
Simple construction: multiple 70
Simple construction: combined 68
Simple construction: induced 63
Lexicographic greedy covering 57
Wheeling systems checker 4 41
Dynamic programming 40
Dynamic construction 40
Simple construction: deleted element 32
Jymccdd programming 32
Tabu search 27
Random greedy covering 23
Cyclic covering found by search program 20
Simple construction: added element to c(v-1,k-1,t) covering 18
Cyclic covering 18
Steiner quadruple system 16
Simple optimization 16
Wheeling systems checker 12
Sidorenko construction 11
Constructed using simulated annealing 11
Simple combine 10
Design is based on c (v - 1, k, t) = b - v 10
Cyclic construction 10
Simulated annealing covering 9
See paper by jrj abel et al. in discrete mathematics 307 (2007) 9
Cyclic covering found by a search program 9
Nurmela and ostergard simulated annealing cover 8
Nurmela-ostergard symmetric covering 7
Affine geometry covering 7
Induced 6
Exhaustive search 6
Covering provided by rade belic 6
Steiner triple system 5
Sidorenko method 5
See jct series a 49, 308-322 (1988) 5
Extraction/remainder 5
Simple construction: added element to c(v,k-1,t) covering 4
See journal 4
Nurmela-ostergard simulated annealing covering design 4
Hanani construction (see canadian journal 4
Cyclic symmetry 4
Constructed using difference families 4
Wo - otimizador de rodas 3
Wheel generator, based on jan de heer and steve muir work 3
Wheel generator and covermaster 3
Using ininuga, by uros boltin 3
Steiner system 3
Reverse engineering smaller systems 3
Projective plane 3
Mills, jcta 13 (1972) pp. 55-78. 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
Found by a hill-climbing program 3
Cyclic steiner system 3
Covering provided by alex sidorenko (personal communication) 3
Covering found by a hill-climbing program 3
Constructed using dynamic programming 3
Colex greedy covering 3
Wheel generator and private tools 2
Using wsc4 2
Steiner system (derived) 2
Simple method construction 2
Several methods (including sa) 2
Nurmela-ostergard simulated annealing covering 2
Korelacje_777ch__farplay_v2 2
Jcd 1998, pp. 21-41 2
Ininuga 2
Hill-climb on cyclic orbits 2
Hill-climb on affine orbits 2
Covering provided by john cock (personal communication) 2
Covering provided by dietmar pree 2
Covering pairs by quads: mills, jcta 15:138-166, 1973. 2
Constructed using difference sets 2
Constructed by simulated annealing 2
Communicated by d. todorov, using pg(2,4) 2
Communicated by d. todorov, using pg(2,3) 2
Affine plane 2
Wsc program 1
Wsc 4 shrinking tools 1
Wheeling systems checker and wheel generator 1
Wheeling systems checker 4 - coming soon 1
Wheel generator, based on chaoying dai, ben li and michel toulouse work 1
Using wheel generator 1
Using wg and wsc4 1
Using td(6,16) and 6*modified c(18,6,2,2) 1
Using td(6,15) and 6*modified c(18,6,2,2) 1
Using resolvable c(72,4,2), see lamken, mullen and rees (jcd, 1997-1) 1
Using resolvable c(68,4,2), see lamken, mullen and rees (jcd, 1997-1) 1
Using rc(60,3,2) by lamken and mills (1993) 1
Using rc(54,3,2) 1
Using rc(45,3,2) 1
Using a resolvable c(54,6,2,2) 1
Using a 4−gdd 1
Using a (v,4,22*)-pbd and c(22,4,2) 1
Unusual methods 1
Tripling a resolvable c(25,5,2) 1
Td(7,13) and 7 * modified c(15,7,2) 1
Td(4,24) + 4*c(27,4,2) 1
Td(4,24) + 4 * c(26,4,2) 1
Td(4,23) + 4 * c(25,4,2) 1
Td(4,19) & 4 * c(21,4,2) 1
Td(4,18) + 4 * c(21,4,2) 1
Td(4,15) and 4 * modified c(18,4,2) 1
Td(4,12) & 4 * c(15,4,2) 1
Superfluous-element hill climb on a random greedy covering 1
Superfluous-element hill climb on a covering 1
Steiner system, taken 1
Simple multiple 1
Simple construction: doubled (50,8,3) and deleted an element 1
Simple construction: doubled (50,8,2) and deleted an element 1
Simple construction: doubled (50,11,2) and deleted an element 1
Simple construction: doubled (50,10,2) and deleted an element 1
Simple construction: 1
See w h mills in congressus numerantium 10 (1974) pp563-581 1
See paper in journal 1
See j comb des , vol. 15, no. 6, pp. 511-533, 2007 1
See designs, codes and cryptography 17 (1999), 181-186 1
Reverse engineering 1
Replicate 4 columns 1
Quadrupling construction 1
Quadrupling a full c(10,5,5) 1
Produced with covermaster (by john rawson), wheelgenerator (by anastasios tampakis) and private tools. 1
Private tools - assisted by wheel generator 1
Privat tools 1
Of,28,10,6,2899 1
Of,24,15,7,165 1
Not wsc v4 1
Normal methods 1
Mills, ars combinatoria, 8 (1979) pg. 270 1
Mills, ars combinatoria, 8 (1979) pg. 254 1
Mill, jcta 15 (1973) 138-166 1
Method 1
Marco meoli 1
Korelacje_777ch__farplay_v1 1
Korelacje_777ch__fairplay_v2 1
Jymccdd programmingj 1
Ininuga (by uros boltin) 1
Group theory 1
From td(9,9) and 9*c(14,9,2,2,3) with 5 holes 1
From td(7,12) and 7*c(15,7,2,2,6) with 3 holes 1
From td(7,12) and 7*c(13,7,2,2,5) with 2 holes 1
From 57,8,2 1
From 1-flat on 42 numbers 1
Ferramentas particulares 1
Ex 8 1
Ex 62 1
Ex 54 1
Ex 28 1
Ex 1988 1
Ex 16 1
Ex 15 1
Ex 13 1
Doubling resolvable c(25,5,2) 1
Doubling c(42,4,3) 1
Doubling c(36,4,3) 1
Doubling c(30,4,3) 1
Doubling c(18,4,3) 1
Cyclic symmetrical 1
Cyclic covering on z5*z7 1
Cyclic covering on z3*z17 with one point at infinity 1
Cyclic 1
Covering provided by konstantin katskov, found by exhaustive search 1
Covering produced by floyd l. oats, using a ranking and reduction process 1
Covering pairs by quints, mullin, jcmcc 2:133-146, 1987 1
Covering pairs by quints, mills & mullin, jcta 49:308-322, 1988 1
Covering found by rade belic 1
Covering found by john rawson 1
Covering 1
Construction combined 1
Communicated by d. todorov 1
Combinado 1
Chain rule (64,32,6)x(32,24,6) 1
Block-array construction (gordon, patashnik, petro and taylor) 1
Block covering 1
Based on work by kleszek 1
Based on work by chaoying dai, ben li and michel toulouse 1