A155893 Least positive integer such that a(n)! starts with n, both written in base 8.

1, 2, 4, 16, 13, 3, 46, 27, 7, 14, 6, 32, 10, 39, 5, 20, 86, 50, 11, 26, 121, 18, 38, 4, 31, 199, 34, 12, 139, 28, 63, 62, 61, 67, 60, 125, 59, 16, 37, 58, 47, 108, 23, 21, 41, 13, 112, 71, 194, 56, 25, 30, 302, 19, 166, 46, 55, 150, 83, 116, 219, 73, 90, 140, 164, 54, 207

Offset: 1

Author

M. F. Hasler, Feb 01 2009

Keywords

• base
• nonn

Crossrefs

Cf. A155891, A155892, A018799, A076219.

Programs

PARI

A155893(n)={ local( F=1,k=1 ); while( F\1!=n, F*=k++; while( F>=n+1, F/=8 )); k}