A103798 Integers k such that A019565(k)-1 and A019565(k)+1 are both primes.

3, 7, 11, 27, 31, 47, 51, 67, 107, 123, 135, 151, 159, 163, 175, 211, 251, 259, 279, 295, 479, 527, 539, 607, 619, 631, 771, 783, 847, 999, 1035, 1051, 1071, 1183, 1279, 1295, 1299, 1323, 1375, 1399, 1411, 1439, 1451, 1479, 1571, 1691, 1715, 1759, 1787, 1991

Offset

1,1

Links

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

Example

A019565(3) = 6. 5 and 7 are twin primes, so a(1) = 3.
A019565(7) = 30. 29 and 31 are twin primes, so a(2) = 7.

Crossrefs

Cf. A019565, A103796, A103797.

Sequence in context: A092284 A024459 A001645 * A093361 A227364 A051202

Adjacent sequences: A103795 A103796 A103797 * A103799 A103800 A103801

Keyword

easy,nonn

Author

Lei Zhou, Feb 22 2005

Status

approved