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A045520 n! has initial digit '1'. 18
0, 1, 5, 15, 19, 22, 25, 27, 35, 37, 42, 45, 48, 51, 55, 59, 63, 64, 69, 70, 76, 77, 78, 88, 89, 90, 91, 92, 93, 94, 95, 104, 105, 106, 107, 108, 109, 110, 111, 112, 123, 124, 125, 132, 133, 134, 140, 141, 146, 147, 152, 157, 158, 162, 167, 171, 175, 176, 179, 183 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000

Index entries for sequences related to factorial numbers

MATHEMATICA

Select[ Range[ 0, 200 ], IntegerDigits[ #! ][ [ 1 ] ] == 1 & ]

PROG

(PARI) isok(n) = digits(n!)[1] == 1; \\ Michel Marcus, Feb 07 2017

CROSSREFS

For factorials with initial digit d (1 <= d <= 9) see A045509, A045510, A045511, A045516, A045517, A045518, A282021, A045519; A045520, A045521, A045522, A045523, A045524, A045525, A045526, A045527, A045528, A045529. See also A000142.

Sequence in context: A174598 A022417 A102180 * A032472 A290551 A045176

Adjacent sequences:  A045517 A045518 A045519 * A045521 A045522 A045523

KEYWORD

nonn,base

AUTHOR

Jeff Burch

STATUS

approved

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Last modified October 18 11:56 EDT 2018. Contains 316321 sequences. (Running on oeis4.)