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A103798 Integers k such that A019565(k)-1 and A019565(k)+1 are both primes. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

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.

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

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)