OFFSET
1,1
COMMENTS
Subsequence of A164097. - R. J. Mathar, Jul 06 2010
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
6*3 + 7 = 5^2, so 3 is a term;
6*7 + 7 = 7^2, so 7 is a term;
6*19 + 7 = 11^2, so 19 is a term;
6*27 + 7 = 13^2, so 27 is a term.
MATHEMATICA
Select[Range[10000], PrimeQ[Sqrt[6 # + 7]]&] (* Vincenzo Librandi, Apr 06 2013 *)
PROG
(Magma) [(p^2-7)/6: p in PrimesInInterval(4, 250)]; // Vincenzo Librandi, Apr 06 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Dec 04 2009
STATUS
approved