OFFSET
1,1
COMMENTS
Conjecture: 2^a(n)-1 is not prime; in other words, these primes are included in A054723.
2*a(n) + 1299 is a square. - Vincenzo Librandi, Apr 09 2015
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..3000
MATHEMATICA
Select[Table[2n^2 + 74n + 35, {n, 600}], PrimeQ]
PROG
(Magma) [a: n in [1..600] | IsPrime(a) where a is 2*n^2 + 74*n + 35];
CROSSREFS
Cf. Primes of the form 2*n^2+2*(2*k+3)*n+(2*k+1): A176549 (k=0), A154577 (k=2), A154592 (k=3), A154601 (k=4), A217494 (k=7), A217495 (k=10), A217496 (k=11), A217497 (k=12), A217498 (k=13), A217499 (k=16), this sequence (k=17), A217501 (k=18), A217620 (k=19), A217621 (k=21).
Cf. A054723.
Subsequence of A002145.
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Oct 09 2012
STATUS
approved