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

Author

Lei Zhou, Feb 22 2005

Keywords

• easy
• nonn

Links

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

Crossrefs

Cf. A019565, A103796, A103797.

Programs

Maple

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.