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A152865 Beginnings of maximal chains of primes with two members (one link). 8
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 (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

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: A139895 A304688 A167470 * A108272 A121999 A069530

Adjacent sequences:  A152862 A152863 A152864 * A152866 A152867 A152868

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Dec 17 2008

STATUS

approved

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Last modified October 21 19:29 EDT 2019. Contains 328315 sequences. (Running on oeis4.)