A134197 Primes that occur in A126990 twice.

3, 7, 13, 23, 31, 47, 61, 73, 89, 103, 113, 131, 139, 151, 167, 181, 193, 199, 233, 241, 271, 293, 317, 337, 359, 389, 409, 421, 433, 449, 467, 491, 509, 523, 547, 577, 601, 619, 647, 661, 691, 709, 743, 761, 773, 797, 811, 823, 839, 863, 887, 919, 941, 953

Offset

1,1

Comments

It seems, as tested up to prime(100000), that triplicates of primes do not occur in A126990, so this sequence stays the same if defined as either "... in A126990 exactly twice" or "... in A126990 at least twice." - Michel Marcus and R. J. Mathar, Nov 07 2013

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Prog

(PARI) lista(nn) = {last = A126990(1); for (n=2, nn, new = A126990(n); if (new == last, print1(new, ", ")); last = new; ); } \\ Michel Marcus, Nov 07 2013

Crossrefs

Cf. A126990, A134196.

Sequence in context: A091652 A334163 A291546 * A053001 A053607 A209407

Adjacent sequences: A134194 A134195 A134196 * A134198 A134199 A134200

Keyword

nonn

Author

Artur Jasinski, Oct 13 2007

Extensions

More terms from Michel Marcus, Nov 07 2013

Status

approved