A044464 Numbers n such that string 1,1 occurs in the base 5 representation of n but not of n+1.

6, 34, 56, 81, 106, 131, 174, 181, 206, 231, 256, 284, 306, 331, 356, 381, 409, 431, 456, 481, 506, 534, 556, 581, 606, 631, 659, 681, 706, 731, 874, 881, 909, 931, 956, 981, 1006, 1034, 1056, 1081, 1106, 1131, 1159, 1181, 1206