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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 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 STATUS approved

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Last modified October 23 12:54 EDT 2019. Contains 328345 sequences. (Running on oeis4.)