A044084 Numbers n such that string 1,2 occurs in the base 5 representation of n but not of n-1.

7, 32, 35, 57, 82, 107, 132, 157, 160, 175, 207, 232, 257, 282, 285, 307, 332, 357, 382, 407, 410, 432, 457, 482, 507, 532, 535, 557, 582, 607, 632, 657, 660, 682, 707, 732, 757, 782, 785, 800, 832, 857, 875, 1007, 1032, 1035, 1057