A162587 - OEIS

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A162587

Prime numbers p = 8n + 7 for which k = (7 * (256^n - 16^n) + n^2) / (n * p) is an integer

23, 31, 47, 71, 79, 103, 127, 151, 167, 199, 223, 263, 367, 439, 487, 607, 631, 647, 727, 823, 887, 967, 1031, 1087, 1303, 1327, 1367, 1447, 1543, 1567, 1607, 1879, 1951, 2207, 2311, 2503, 2647, 2671, 2887, 3079, 3271, 3463, 3527, 3607, 3727, 3847, 3967

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Transpose[Select[Table[{n, 8n+7}, {n, 500}], PrimeQ[Last[#]]&&IntegerQ[(7*(256^First[ #]-16^First[#])+First[#]^2)/Times@@#]&]][[2]] (* Harvey P. Dale, Sep 13 2014 *)

CROSSREFS

Cf. A162586

Cf. A158034, A158035

Cf. A161896, A161897

Sequence in context: A031924 A257528 A240886 * A033216 A139837 A145375

Adjacent sequences: A162584 A162585 A162586 * A162588 A162589 A162590

KEYWORD

easy,nonn

AUTHOR

Reikku Kulon, Jul 07 2009

STATUS

approved