OFFSET
1,1
COMMENTS
a(5) and a(6) are 125 and 266 decimal digits long, respectively. - Derek Orr, Aug 28 2014
EXAMPLE
2*4^0 - 0 = 2 is prime, thus 2 is a member of this sequence.
MATHEMATICA
Select[Table[2^(2n + 1) - n, {n, 0, 127}], PrimeQ] (* Alonso del Arte, Sep 16 2014 *)
PROG
(Magma) [a: n in [0..500] | IsPrime(a) where a is 2*4^n - n];
(PARI)
for(n=0, 10^3, if(ispseudoprime(2^(2*n+1)-n), print1(2^(2*n+1)-n, ", "))) \\ Derek Orr, Aug 28 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Aug 28 2014
STATUS
approved