

A045510


Factorials having initial digit '2'.


19




OFFSET

1,1


COMMENTS

Benford's law shows that this sequence will contain about (log 3  log 2)/log 10 =~ 18% of factorials. [Charles R Greathouse IV, Nov 13 2010]


LINKS

Table of n, a(n) for n=1..7.


PROG

(PARI) lista(nn) = {for (n=1, nn, if (digits(n!)[1] == 2, print1(n!, ", ")); ); } \\ Michel Marcus, Dec 13 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.
Sequence in context: A159932 A100010 A319761 * A226325 A065665 A321350
Adjacent sequences: A045507 A045508 A045509 * A045511 A045512 A045513


KEYWORD

nonn,base


AUTHOR

Jeff Burch


STATUS

approved



