OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
19 is in this sequence because 2*5^2+2*5-41=19.
MATHEMATICA
Select[Table[2 n^2 + 2 n - 41, {n, 4, 100}], PrimeQ] (* Vincenzo Librandi, Sep 11 2013 *)
PROG
(Magma) [a: n in [4..100] | IsPrime(a) where a is 2*n^2+2*n-41 ]; // Vincenzo Librandi, Sep 11 2013
(PARI) is(n)=isprime(2*n^2+2*n-41) \\ Charles R Greathouse IV, Sep 11 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 27 2009
STATUS
approved