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
Offset: 1
Links
- Nick Hobson, Table of n, a(n) for n = 1..4095
- Nick Hobson, C program.
Programs
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C
See Links section.
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PARI
A155894(n)={ local( F=1,k=1 ); while( F\1!=n, F*=k++; while( F>=n+1, F/=16 )); k}