

A136365


Numbers k such that A075986(k) is prime.


6




OFFSET

1,2


LINKS



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) = prime(k)).


KEYWORD

nonn,hard,more


AUTHOR



EXTENSIONS



STATUS

approved



