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A161897 Prime numbers p for which k = (3^p - 3 * 3^((p + 1) / 2) - 6p + 6) / (3p^2 - 3p) is an integer 4
11, 23, 47, 59, 83, 107, 167, 179, 227, 263, 347, 359, 383, 467, 479, 503, 563, 587, 719, 839, 863, 887, 983, 1019, 1187, 1283, 1307, 1319, 1367, 1439, 1487, 1523, 1619, 1823, 1907, 2027, 2039, 2063, 2099, 2207, 2447, 2459, 2579, 2819, 2879, 2903, 2963, 2999 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Superset of the inverse Sophie Germain primes (A005385): (p - 1) / 2 is almost always prime.

CROSSREFS

Cf. A161896 A000040, A005385 A158034, A158035, A158036 A145918

Sequence in context: A198588 A068231 A073024 * A145994 A139834 A100558

Adjacent sequences:  A161894 A161895 A161896 * A161898 A161899 A161900

KEYWORD

easy,nonn

AUTHOR

Reikku Kulon (reikku(AT)gmail.com), Jun 21 2009

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Last modified February 16 16:34 EST 2012. Contains 205938 sequences.