OFFSET
1,1
COMMENTS
Terms are congruent to 1 mod 4.
Also primes of the form 6*x^2+10*x+5.
If one were to take the sum of all numbers in the open interval between n^2 and (n+1)^2 and called this sum A and did the same for (n+1)^2 and (n+2)^2 and called this sum B, then B-A is a prime, resulting from the same 6*n^2 + 10*n + 5. - J. M. Bergot, Jun 11 2011
MATHEMATICA
Select[Table[x^2+5(x+1)^2, {x, 0, 500}], PrimeQ] (* Harvey P. Dale, Dec 16 2010 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Apr 21 2010
EXTENSIONS
Provided less ambiguous definition - R. J. Mathar, May 04 2010
More terms from Vincenzo Librandi and R. J. Mathar, Apr 21 2010
STATUS
approved