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A152868

Beginnings of maximal chains of primes with five members (four links).

61, 1069, 2293, 2879, 5441, 20347, 145823, 183949, 187171, 207629, 219649, 278087, 412171, 420467, 421273, 507503, 536479, 696937, 698311, 774929, 792283, 1028081, 1310137, 1432927, 1470757, 1726211, 1803881, 1861817, 1904477, 1928561

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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..1100

EXAMPLE

First maximal chain of primes with five members (four links) is 61, 67, 71, 73, 79; the linking primes are 2371, 2693, 2953, 3271.

PROG

(PARI) {n=1; while(n<144100, c=0; a=prime(n); while(isprime(n*prime(n)+(n+1)*prime(n+1)), c++; n++); if(c==4, 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, A152867, A152869, A152963, A152964.

Sequence in context: A264306 A138790 A057534 * A218112 A154428 A262017

Adjacent sequences: A152865 A152866 A152867 * A152869 A152870 A152871

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Dec 17 2008

STATUS

approved

URL: https://oeis.org/A152868

⇱ A152868 - OEIS