A018862 5^a(n) is smallest power of 5 beginning with n.

0, 2, 5, 11, 1, 4, 7, 50, 10, 63, 23, 3, 56, 26, 6, 69, 49, 29, 9, 82, 62, 42, 22, 12, 2, 75, 55, 45, 25, 15, 5, 88, 68, 58, 48, 38, 28, 18, 8, 91, 81, 71, 61, 51, 41, 31, 21, 11, 104, 94, 84, 74, 167, 64, 54, 44, 137, 34, 24, 117, 14, 4, 97, 87, 180, 77, 67, 160, 57, 150, 47, 37, 130

Offset

1,2

Links

D. Mondot, Table of n, a(n) for n=1..32699

Prog

(PARI) a(n) = my(k=0, ss=Str(n)); while(strsplit(Str(5^k), ss)[1] != "", k++); k; \\ Michel Marcus, Aug 19 2025

Crossrefs

Cf. A018861.

Cf. A018858, A018860, A018864, A018866, A018868, A062525, A062526.

Sequence in context: A342490 A163784 A215615 * A394737 A332009 A175310

Adjacent sequences: A018859 A018860 A018861 * A018863 A018864 A018865

Keyword

nonn,base

Author

David W. Wilson

Status

approved