A018861 Smallest power of 5 that begins with n.

1, 25, 3125, 48828125, 5, 625, 78125, 88817841970012523233890533447265625, 9765625, 108420217248550443400745280086994171142578125, 11920928955078125, 125, 1387778780781445675529539585113525390625, 1490116119384765625, 15625

Offset: 1

Author

David W. Wilson

Keywords

• nonn
• base

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..326

Crossrefs

Cf. A018802 (k=2), A018857 (k=3), A018859 (k=4), this sequence (k=5), A018863 (k=6), A018865 (k=7), A018867 (k=8), A018869 (k=9).

Formula

a(n) = 5^A018862(n). - Seiichi Manyama, Jan 29 2017

a(5^n) = 5^n for n >= 0. - Seiichi Manyama, Jan 29 2017