OFFSET
1,2
COMMENTS
Subsequence of A006452 that consists of the terms n such that n^2+1 is prime.
a(7) is too large to include here (see b-file). - Max Alekseyev, Jan 30 2014
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..12
MATHEMATICA
Select[Range[155000], PrimeQ[#^2+1]&&OddQ[Sqrt[8(#^2-1)+1]]&] (* Harvey P. Dale, Jul 19 2019 *)
PROG
(C) // see A226069.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alex Ratushnyak, May 25 2013
EXTENSIONS
Terms a(7)-a(12) from Max Alekseyev, Jan 30 2014
STATUS
approved