login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A045510 Factorials having initial digit '2'. 19
2, 24, 20922789888000, 2432902008176640000, 25852016738884976640000, 265252859812191058636308480000000, 263130836933693530167218012160000000 (list; graph; refs; listen; history; text; internal format)
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: A100815 A159932 A100010 * A226325 A065665 A249634

Adjacent sequences:  A045507 A045508 A045509 * A045511 A045512 A045513

KEYWORD

nonn,base

AUTHOR

Jeff Burch

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 23 13:38 EST 2018. Contains 299581 sequences. (Running on oeis4.)