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A139407 Numbers k such that 8*k+3 and 8*k+7 are primes. 2
2, 5, 8, 20, 38, 47, 62, 80, 92, 107, 110, 113, 185, 197, 233, 260, 275, 293, 317, 332, 335, 338, 377, 395, 398, 488, 500, 653, 668, 722, 740, 755, 818, 863, 905, 950, 962, 965, 1052, 1055, 1067, 1097, 1100, 1193, 1202, 1217, 1223, 1235, 1262, 1280, 1283 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

a = {}; Do[If[PrimeQ[8 n + 3] && PrimeQ[8 n + 7], AppendTo[a, n]], {n, 1, 1000}]; a

Select[Range[1500], And@@PrimeQ[8 # +{3, 7}]&] (* Harvey P. Dale, Mar 24 2011 *)

CROSSREFS

Cf. A125821, A125822, A139402, A139404, A139405, A139406.

Sequence in context: A104721 A245191 A281104 * A107384 A205596 A092446

Adjacent sequences:  A139404 A139405 A139406 * A139408 A139409 A139410

KEYWORD

nonn

AUTHOR

Artur Jasinski, Apr 19 2008

STATUS

approved

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Last modified May 11 21:35 EDT 2021. Contains 343808 sequences. (Running on oeis4.)