A105409 Indices n of primes p(n), p(n+2) such that p(n)-2 and p(n+2)-2 are both prime.

4, 6, 27, 34, 42, 44, 82, 141, 143, 172, 177, 235, 287, 295, 314, 319, 429, 459, 474, 476, 485, 578, 580, 585, 672, 744, 773, 863, 871, 873, 892, 935, 958, 1031, 1116, 1166, 1168, 1170, 1231, 1340, 1352, 1405, 1463, 1549, 1622, 1652, 1708, 1824, 1834, 1868

Offset

2,1

Links

Table of n, a(n) for n=2..51.

Prog

(PARI) pnpk(n, m, k) = \ both are prime { local(x, l1, l2, v1, v2); for(x=1, n, v1 = prime(x)+ k; v2 = prime(x+m)+k; if(isprime(v1)&isprime(v2), \ print1(x", ") print1(v1", ") ) ) }

Crossrefs

Cf. A053778.

Sequence in context: A099941 A074120 A054265 * A109934 A068321 A349647

Adjacent sequences: A105406 A105407 A105408 * A105410 A105411 A105412

Keyword

nonn

Author

Cino Hilliard, May 01 2005

Status

approved