

A136365


Numbers n such that A075986(n) is prime.


6




OFFSET

1,2


LINKS

Table of n, a(n) for n=1..3.


MATHEMATICA

f=1; Do[ p=Prime[n]; f=f + 1/p^2; g=Numerator[ f ]; If[ PrimeQ[ g ], Print[ {n, g} ] ], {n, 1, 210} ]


CROSSREFS

Cf. A075986 = Numerator of 1+1/p(1)^2+ ... + 1/p(n)^2, where p(k) = kth prime. Cf. A024528, A125707. Cf. A136366, A136367, A136368, A136369, A136370, A136371.
Sequence in context: A045149 A031511 A101273 * A031900 A120819 A115078
Adjacent sequences: A136362 A136363 A136364 * A136366 A136367 A136368


KEYWORD

bref,hard,more,nonn


AUTHOR

Alexander Adamchuk, Dec 27 2007


STATUS

approved



