A098422 Primes occurring in exactly two prime triples (p,q,r) with p<q<r=p+6.

7, 19, 41, 43, 101, 109, 193, 197, 227, 229, 311, 313, 461, 463, 823, 827, 857, 859, 881, 883, 1091, 1093, 1301, 1303, 1427, 1429, 1483, 1489, 1871, 1877, 1997, 1999, 2083, 2087, 2687, 2689, 3253, 3257, 3461, 3467, 4517, 4519, 4787, 4789, 5231, 5233, 5651

Offset

1,1

Comments

A098418(a(n)) = 2; subsequence of A098420.

Links

Table of n, a(n) for n=1..47.

Eric Weisstein's World of Mathematics, Prime Triplet

Mathematica

Select[Tally[Flatten[Select[Partition[Prime[Range[800]], 3, 1], #[[3]]- #[[1]] == 6&]]], #[[2]]==2&][[All, 1]] (* Harvey P. Dale, Jun 01 2019 *)

Crossrefs

Cf. A098419, A098421, A098423.

Sequence in context: A295077 A239359 A120720 * A191066 A087762 A195349

Adjacent sequences: A098419 A098420 A098421 * A098423 A098424 A098425

Keyword

nonn

Author

Reinhard Zumkeller, Sep 07 2004

Status

approved