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A152866 Beginnings of maximal chains of primes with three members (two links). 8
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 7 15:01 EST 2022. Contains 358667 sequences. (Running on oeis4.)