A116947 - OEIS

%I #11 Jun 13 2017 12:45:04

%S 1,2,3,5,7,17,20,22,28,30,40,45,67,68,70,75,82,85,87,88,95,108,123,

%T 125,140,150,153,163,172,190,197,200,210,217,220,223,232,237,248,268,

%U 270,282,283,287,303,310,320,333,340,358,367,403,405,407,423,438,445,447

%N Numbers n such that 4*n^6 + 1 is prime.

%e If n=197 then (4*n^6 + 1) is a prime with 15 digits.

%t Select[Range[500], PrimeQ[(4*#^6 + 1)] &] (* _Stefan Steinerberger_, Apr 06 2006 *)

%o (PARI) is(n)=isprime(4*n^6+1) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A115104, A001912, A115349.

%K nonn,less,easy

%O 1,2

%A _Parthasarathy Nambi_, Apr 03 2006

%E More terms from _Stefan Steinerberger_, Apr 06 2006