Solution counts Vertical: digit sum (multiples of 3 omitted) Horizontal: top left-hand digit | 1 2 3 4 5 6 7 8 9 | total ----+--------------------------------------+------ 2 | | 4 | | 5 | | 7 | | 8 | | 10 | | 11 | 3 1 1 1 | 6 13 | 3 6 10 1 | 20 14 | | 16 | | 17 | 51 66 71 24 16 6 4 | 238 19 | 66 47 70 40 52 24 17 9 15 | 340 20 | | 22 | | 23 | 88 137 152 77 116 118 148 61 43 | 940 25 | 84 99 91 93 124 71 79 58 45 | 744 26 | | 28 | | 29 | 22 20 37 30 66 51 32 44 34 | 336 31 | 3 14 6 5 3 8 | 39 32 | | 34 | | 35 | 1 1 2 1 | 5 37 | 5 3 | 8 38 | | 40 | | 41 | | 43 | | 44 | | ----+--------------------------------------+------ tot | 317 376 433 268 390 276 292 175 149 | 2676