A152866 Beginnings of maximal chains of primes with three members (two links).

5, 43, 139, 227, 277, 773, 947, 991, 1237, 1481, 1549, 1601, 1871, 1993, 2339, 3119, 3169, 3217, 3259, 3371, 3709, 3853, 4013, 4219, 4483, 4951, 5051, 5107, 5147, 5419, 5527, 6637, 6977, 7477, 7699, 8539, 10139, 10267, 11783, 11981, 12163, 12263

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 three members (two links) is 5, 7, 11; the linking primes are 43, 83.

Prog

(PARI) {n=1; while(n<1470, c=0; a=prime(n); while(isprime(n*prime(n)+(n+1)*prime(n+1)), c++; n++); if(c==2, 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, A152867, A152868, A152869, A152963, A152964.

Sequence in context: A106940 A106941 A139885 * A102851 A173554 A126963

Adjacent sequences: A152863 A152864 A152865 * A152867 A152868 A152869

Keyword

nonn

Author

Klaus Brockhaus, Dec 17 2008

Status

approved