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A139447 Numbers n such that primorial(n)/2 + 64 is prime. 5
2, 3, 8, 11, 94, 127, 201, 211, 257, 259, 392, 1305, 5234, 13013, 13679, 16866, 23879 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(18) > 25000. - Robert Price, Mar 29 2017

LINKS

Table of n, a(n) for n=1..17.

MATHEMATICA

k = 1/2; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k + 64], Print[n]; AppendTo[a, n]], {n, 325}]; a

CROSSREFS

Cf. A067026, A067027, A139439-A139457, A103514.

Sequence in context: A041711 A127939 A041587 * A042783 A042583 A128839

Adjacent sequences:  A139444 A139445 A139446 * A139448 A139449 A139450

KEYWORD

nonn

AUTHOR

Artur Jasinski, Apr 21 2008

EXTENSIONS

a(12) from Ray Chandler, Jun 16 2013

a(13)-a(17) from Robert Price, Mar 29 2017

STATUS

approved

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Last modified December 17 02:35 EST 2018. Contains 318192 sequences. (Running on oeis4.)