

A177876


The number of distinct prime factors in LucasLehmer numbers A003010(k2) divisible by 2^k1.


1




OFFSET

1,1


COMMENTS

a(5) of this sequence will require the factorization of A003010(15), an 18742digit integer divisible by 2^171.


LINKS

Table of n, a(n) for n=1..4.


EXAMPLE

a(1)=2 because A003010(1)=14, contains exactly 2 distinct prime factors;
a(2)=3 because A003010(3)=37634, contains exactly 3 distinct prime factors;
a(3)=3 because A003010(5)=2005956546822746114, contains exactly 3 distinct prime factors;
a(4)=4 because A003010(11)=the associated 1172digit LucasLehmer number, contains exactly 4 distinct prime factors.


CROSSREFS

Cf. A000040, A000668, A003010, A177874, A177875, A177879, A177892
Sequence in context: A096393 A010120 A012887 * A079633 A285891 A060573
Adjacent sequences: A177873 A177874 A177875 * A177877 A177878 A177879


KEYWORD

nonn,hard,bref,more


AUTHOR

G. L. Honaker, Jr., Dec 13 2010


STATUS

approved



