A105410 Indices n of primes p(n), p(n+3) such that p(n)-2 and p(n+3)-2 are both prime.

3, 8, 11, 18, 50, 58, 114, 174, 207, 210, 213, 254, 263, 266, 316, 321, 344, 396, 406, 461, 493, 496, 499, 543, 556, 582, 614, 626, 644, 724, 727, 741, 847, 932, 1099, 1102, 1118, 1121, 1233, 1236, 1261, 1285, 1443, 1616, 1619, 1640, 1705, 1710, 1783, 1792

Offset

2,1

Links

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

Mathematica

Select[Range[2000], PrimeQ[Prime[#]-2]&&PrimeQ[Prime[#+3]-2]&] (* Harvey P. Dale, Jun 02 2011 *)

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

Sequence in context: A184925 A294478 A154485 * A114548 A182759 A022121

Adjacent sequences: A105407 A105408 A105409 * A105411 A105412 A105413

Keyword

nonn

Author

Cino Hilliard, May 02 2005

Status

approved