OFFSET
1,1
LINKS
Zak Seidov, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = 2*A104012(n) + 1.
MATHEMATICA
Select[Prime[Range[200]], PrimeQ[(5*#^2 - 1)/4] &] (* T. D. Noe, May 07 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, May 06 2012
STATUS
approved