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A045526 n! has initial digit '7'. 18

%I

%S 6,56,80,156,161,170,186,200,230,238,277,288,305,307,323,325,327,344,

%T 385,410,451,454,472,475,504,532,547,551,575,592,601,615,645,661,697,

%U 710,724,731,790,800,811,822,848

%N n! has initial digit '7'.

%H Chai Wah Wu, <a href="/A045526/b045526.txt">Table of n, a(n) for n = 1..10000</a>

%H <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a>

%t Select[ Range[ 900 ], IntegerDigits[ #! ] [[1]] == 7 & ]

%o (PARI) isok(n) = digits(n!)[1] == 7; \\ _Michel Marcus_, Feb 08 2017

%Y 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.

%K nonn,base

%O 1,1

%A _Jeff Burch_

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Last modified November 13 11:09 EST 2018. Contains 317133 sequences. (Running on oeis4.)