OFFSET
1,1
LINKS
Ray Chandler, Table of n, a(n) for n = 1..2625
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, t=(s*s+1)/2 and p, q, r, s, t are all prime.
EXAMPLE
p(1)=169219, q=14317534981, r=102495903966079335181, s=5252705164911878795670904374881472151381, ...
CROSSREFS
KEYWORD
nonn
AUTHOR
Ray Chandler, Jun 12 2019
STATUS
approved