OFFSET
1,1
COMMENTS
The associated primes of the quadratic form are in A164580.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
For p=7, p^2+(p+1)/2=53 is prime, which adds p=7 to the sequence.
MATHEMATICA
Select[Prime[Range[500]], PrimeQ[#^2+(#+1)/2]&]
[Harvey P. Dale, Dec 19 2010]
PROG
(Magma) [p: p in PrimesInInterval(3, 2000) | IsPrime(p^2+(p+1) div 2)]; // Vincenzo Librandi, Oct 12 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Aug 17 2009
EXTENSIONS
Edited and extended by R. J. Mathar, Aug 26 2009
STATUS
approved