OFFSET
1,1
LINKS
Ray Chandler, Table of n, a(n) for n = 1..10000
H. Dubner and T. Forbes, Prime Pythagorean triangles, J. Integer Seqs., Vol. 4 (2001), #01.2.3.
FORMULA
For each p(n), q=(p*p+1)/2, r=(q*q+1)/2, s=(r*r+1)/2 and p, q, r, s are all prime.
EXAMPLE
p(5)=271, q=36721, r=674215921, s=227283554064939121.
CROSSREFS
KEYWORD
nonn
AUTHOR
Harvey Dubner (harvey(AT)dubner.com)
EXTENSIONS
More terms from Ray Chandler, Jun 12 2019
STATUS
approved