A044098 Numbers k such that the string 4,1 occurs in the base 5 representation of k but not of k-1.

21, 46, 71, 96, 105, 121, 146, 171, 196, 221, 230, 246, 271, 296, 321, 346, 355, 371, 396, 421, 446, 471, 480, 496, 521, 525, 571, 596, 605, 621, 646, 671, 696, 721, 730, 746, 771, 796, 821, 846, 855, 871, 896, 921, 946, 971