OFFSET
1,1
COMMENTS
For definitions see A152658, of which this is a subsequence.
LINKS
Klaus Brockhaus, Table of n, a(n) for n=1..1100
EXAMPLE
First maximal chain of primes with five members (four links) is 61, 67, 71, 73, 79; the linking primes are 2371, 2693, 2953, 3271.
PROG
(PARI) {n=1; while(n<144100, c=0; a=prime(n); while(isprime(n*prime(n)+(n+1)*prime(n+1)), c++; n++); if(c==4, print1(a, ", ")); n++)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Klaus Brockhaus, Dec 17 2008
STATUS
approved