OFFSET
1,1
COMMENTS
Subsequence of A066049. - Michel Marcus, Oct 29 2014
n such that 2*n^2 - 2 is in A014574. - Robert Israel, Nov 18 2014
LINKS
Colin Barker, Table of n, a(n) for n = 1..1600
EXAMPLE
2 is in this sequence because 2*(2^2-1) - 1 = 5 and 2*(2^2-1) + 1 = 7 are both prime.
MAPLE
select(n -> isprime(2*n^2-3) and isprime(2*n^2-1), [$1 .. 10000]); # Robert Israel, Nov 18 2014
MATHEMATICA
Select[Range[0, 1500], PrimeQ[2 #^2 - 3] && PrimeQ[2 #^2 - 1] &] (* Vincenzo Librandi, Oct 29 2014 *)
PROG
(Magma) [ n: n in [1..1400] | IsPrime(2*(n^2-1)-1) and IsPrime(2*(n^2-1)+1) ];
(PARI) isok(n) = isprime(2*(n^2-1) - 1) && isprime(2*(n^2-1) + 1); \\ Michel Marcus, Oct 31 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Oct 29 2014
STATUS
approved