A155892 -id:A155892

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A155894

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

+10
3

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.

KEYWORD

base,nonn

AUTHOR

M. F. Hasler, Feb 01 2009

STATUS

approved

A155893

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

+10
2

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