A044465 Numbers n such that string 1,2 occurs in the base 5 representation of n but not of n+1.

7, 32, 39, 57, 82, 107, 132, 157, 164, 199, 207, 232, 257, 282, 289, 307, 332, 357, 382, 407, 414, 432, 457, 482, 507, 532, 539, 557, 582, 607, 632, 657, 664, 682, 707, 732, 757, 782, 789, 824, 832, 857, 999, 1007, 1032, 1039, 1057