508 Combinatorial games
Subtraction of primes
The first 100 terms of the Sprague-Grundy sequence
12345678910
0011223340
0112233445
5667704152
6347001122
3348576890
4152604152
634 7 584105 7
684 7 586109 7
48510604152
6041526347
The winning positions within 500 are as follows.0 1 2101126353650568692101116122
126 134 146 156 170 176 188 196 206 218 236 248 254 260 266
290 296 302 310 311 320 326 336 344 356 362 376 386 392 396
404 416 426 446 452 470 476 482 486 494