

A048858


Number of prime factors of 1+(n!)^2 (with multiplicity).


0



1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 2, 1, 3, 2, 2, 2, 2, 2, 5, 3, 4, 3, 1, 3, 5, 7, 2, 2, 6, 4, 4, 5, 4, 3, 3, 3, 4, 4, 4, 2, 5, 5, 7, 2, 3, 8, 9, 3, 3, 4, 3, 2, 4
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OFFSET

0,7


LINKS

Table of n, a(n) for n=0..54.
H. Ibstedt, A Few Smarandache Integer Sequences, Smarandache Notions Journal, Vol. 8, No. 123, 1997, pp. 171183.


MATHEMATICA

Table[Length[FactorInteger[1 + (n!)^2]], {n, 0, 20}] (* T. D. Noe, Oct 17 2011 *)


PROG

(PARI) a(n)=bigomega(n!^2+1) \\ Charles R Greathouse IV, Sep 20 2012


CROSSREFS

Sequence in context: A126067 A327490 A238408 * A246465 A172497 A211226
Adjacent sequences: A048855 A048856 A048857 * A048859 A048860 A048861


KEYWORD

more,nonn


AUTHOR

Charles T. Le (charlestle(AT)yahoo.com)


EXTENSIONS

Corrected by Arkadiusz Wesolowski, Oct 17 2011
Corrected by Charles R Greathouse IV, Sep 20 2012
a(38)a(54) from Giovanni Resta, Jun 26 2018


STATUS

approved



