A018868 -id:A018868 - cp's OEIS frontend

A018867 Smallest power of 8 that begins with n.

1, 262144, 32768, 4096, 512, 64, 73786976294838206464, 8, 9223372036854775808, 1073741824, 1152921504606846976, 1237940039285380274899124224, 134217728, 144115188075855872, 154742504910672534362390528, 16777216

Offset: 1

David W. Wilson

Seiichi Manyama, Table of n, a(n) for n = 1..342

Cf. A018802 (k=2), A018857 (k=3), A018859 (k=4), A018861 (k=5), A018863 (k=6), A018865 (k=7), this sequence (k=8), A018869 (k=9).

a(n) = 8^A018868(n). - Seiichi Manyama, Jan 29 2017

a(8^n) = 8^n for n >= 0. - Seiichi Manyama, Jan 29 2017

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

Original entry on oeis.org

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

David W. Wilson

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

Cf. A018861.

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

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

cp's OEIS Frontend

A018867 Smallest power of 8 that begins with n.

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