A152867 Beginnings of maximal chains of primes with four members (three links).

13, 89, 809, 4561, 6689, 7603, 11321, 16493, 18229, 22153, 24107, 28409, 28687, 29153, 32749, 33013, 54493, 55663, 63337, 63419, 67169, 86011, 90289, 108881, 113647, 116929, 132589, 133187, 136033, 136403, 137791, 145543, 147353, 150583

Offset: 1

Author

Klaus Brockhaus, Dec 17 2008

Keywords

• nonn

Comments

For definitions see A152658, of which this is a subsequence.

Examples

			First maximal chain of primes with four members (three links) is 13, 17, 19, 23; the linking primes are 197, 271, 359.
		

Links

• Klaus Brockhaus, Table of n, a(n) for n=1..1000

Crossrefs

Cf. A152658 (beginnings of maximal chains of primes), A152735 (count of links in n-th maximal chain of primes), A152962 (beginning of the first maximal chain of primes with n links), A152865, A152866, A152868, A152869, A152963, A152964.

Programs

PARI

{n=1; while(n<13900, c=0; a=prime(n); while(isprime(n*prime(n)+(n+1)*prime(n+1)), c++; n++); if(c==3, print1(a, ",")); n++)}