A152865 Beginnings of maximal chains of primes with two members (one link).

29, 37, 109, 131, 251, 269, 293, 359, 389, 401, 449, 461, 491, 547, 569, 607, 631, 743, 757, 857, 887, 971, 1109, 1151, 1163, 1187, 1289, 1301, 1319, 1373, 1427, 1453, 1499, 1613, 1667, 1801, 1831, 1879, 1913, 1979, 2003, 2029, 2137, 2243, 2377, 2393, 2459

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

Second maximal chain of primes with two members (one link) is 37, 41; the linking prime is 977.

Prog

(PARI) {n=1; while(n<365, c=0; a=prime(n); while(isprime(n*prime(n)+(n+1)*prime(n+1)), c++; n++); if(c==1, 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), A152866, A152867, A152868, A152869, A152963, A152964.

Sequence in context: A304688 A341174 A167470 * A333422 A108272 A121999

Adjacent sequences: A152862 A152863 A152864 * A152866 A152867 A152868

Keyword

nonn

Author

Klaus Brockhaus, Dec 17 2008

Status

approved