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A073095 Numbers n such that the final nonzero digit of n! is the same as the last digit of C(2n,n) (in base 10). 0
5, 12, 26, 31, 35, 51, 56, 60, 136, 152, 157, 177, 182, 252, 257, 275, 280, 287, 300, 305, 312, 627, 632, 650, 655, 662, 675, 680, 687, 751, 756, 760, 786, 811, 886, 902, 907, 927, 932, 1251, 1256, 1260, 1286, 1311, 1377, 1382, 1400, 1405, 1412, 1425 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..50.

FORMULA

n such that A008904(n) = C(2n, n) reduced (mod 10)

EXAMPLE

12! = 479001600 C(24,12)= 2704156 and the last nonzero digit of 12! is the same as the last digit of C(24,12) hence 12 is in the sequence.

CROSSREFS

Sequence in context: A223233 A038254 A223321 * A309323 A294017 A212561

Adjacent sequences:  A073092 A073093 A073094 * A073096 A073097 A073098

KEYWORD

base,easy,nonn

AUTHOR

Benoit Cloitre, Aug 18 2002

STATUS

approved

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Last modified June 23 13:50 EDT 2021. Contains 345402 sequences. (Running on oeis4.)