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

1,1

Comments

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

Links

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

Example

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

Prog

(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++)}

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.

Sequence in context: A082099 A282858 A268746 * A026912 A161465 A162300

Adjacent sequences: A152864 A152865 A152866 * A152868 A152869 A152870

Keyword

nonn

Author

Klaus Brockhaus, Dec 17 2008

Status

approved