OFFSET
1,1
COMMENTS
Subsequence of A040117.
Conjecture: except 521, 2^a(n)-1 is not prime; in other words, these primes are included in A054723.
2*a(n) + 327 is a square. - Vincenzo Librandi, Jun 29 2016
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Table[2 n^2 + 38 n + 17, {n, 800}], PrimeQ]
PROG
(Magma) [a: n in [1..200] | IsPrime(a) where a is 2*n^2+38*n+17];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jun 16 2014
STATUS
approved