A111981 Numbers n such that 2n-1 and 2n+3 are consecutive primes.

4, 7, 10, 19, 22, 34, 40, 49, 52, 55, 64, 82, 97, 112, 115, 139, 154, 157, 175, 190, 199, 220, 229, 232, 244, 250, 307, 322, 337, 370, 379, 385, 412, 427, 430, 439, 442, 454, 469, 484, 505, 544, 547, 607, 640, 649, 652, 712, 715, 724, 742, 745, 775, 784, 790

Offset

1,1

Links

Table of n, a(n) for n=1..55.

Formula

a(n) = (A029708(n)-1)/2 = (A029710(n)+1)/2 = (A031505(n)-3)/2.

Crossrefs

Essentially the same as A088762.

Sequence in context: A088408 A027752 A161334 * A338130 A080922 A227686

Adjacent sequences: A111978 A111979 A111980 * A111982 A111983 A111984

Keyword

nonn

Author

Ray Chandler, Aug 24 2005

Status

approved