A031252 Least k such that base 5 representation of n begins at s(k), where s=A031251.

3, 2, 1, 6, 3, 31, 22, 12, 25, 23, 2, 19, 10, 15, 13, 11, 1, 7, 5, 36, 26, 16, 6, 46, 33, 253, 178, 3, 255, 32, 31, 175, 100, 206, 22, 29, 161, 97, 131, 12, 27, 86, 71, 56, 207, 25, 166, 91, 195, 192, 23, 163, 88, 180, 2, 30, 21, 85, 165, 162