A155894 - OEIS

A155894

Least positive integer such that a(n)! starts with n, both written in base 16.

1, 2, 10, 36, 9, 3, 5, 24, 8, 43, 82, 25, 30, 46, 64, 62, 60, 68, 7, 14, 70, 18, 13, 4, 31, 272, 19, 12, 97, 35, 161, 140, 20, 86, 27, 74, 131, 11, 502, 234, 47, 181, 386, 21, 6, 996, 52, 232, 144, 32, 393, 189, 199, 281, 10, 490, 39, 154, 83, 22, 28, 577, 63, 65, 88, 61, 115

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Nick Hobson, Table of n, a(n) for n = 1..4095

Nick Hobson, C program.

PROG

(PARI) A155894(n)={ local( F=1, k=1 ); while( F\1!=n, F*=k++; while( F>=n+1, F/=16 )); k}

CROSSREFS

Cf. A155891, A155892, A155893, A018799, A076219.

Sequence in context: A135963 A140954 A309889 * A317454 A244715 A212573

Adjacent sequences: A155891 A155892 A155893 * A155895 A155896 A155897

KEYWORD

base,nonn

AUTHOR

M. F. Hasler, Feb 01 2009

STATUS

approved