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A158035 2 * A158034 + 1, prime numbers p for which f = (2^p - 2^((p - 1) / 2 + 1) + 4p^2 - 8p) / (2p^2 - 2p) is an integer 7
7, 23, 47, 167, 263, 359, 383, 479, 487, 503, 719, 839, 863, 887, 983, 1319, 1367, 1439, 1487, 1783, 1823, 2039, 2063, 2207, 2447, 2879, 2903, 2999, 3023, 3079, 3119, 3167, 3623, 3863, 4007, 4079, 4127, 4423, 4679, 4703, 4799, 4919, 5023, 5087, 5399, 5639 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

(p - 1) / 2 is often prime.

CROSSREFS

Cf. A158034

Cf. A002515 (Lucasian primes)

Cf. A145918 (exponential Sophie Germain primes)

Cf. A046318, A139876 (related to composite members of A158034: 243, 891, 1539, and 2511)

Sequence in context: A139830 A153210 A185955 * A101789 A162290 A180044

Adjacent sequences:  A158032 A158033 A158034 * A158036 A158037 A158038

KEYWORD

easy,nonn

AUTHOR

Reikku Kulon (reikku(AT)gmail.com), Mar 11 2009

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Last modified February 17 18:11 EST 2012. Contains 206061 sequences.