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Numbers n such that primorial(n)/2 + 64 is prime.
5

%I #7 Mar 29 2017 19:46:26

%S 2,3,8,11,94,127,201,211,257,259,392,1305,5234,13013,13679,16866,23879

%N Numbers n such that primorial(n)/2 + 64 is prime.

%C a(18) > 25000. - _Robert Price_, Mar 29 2017

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

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

%K nonn

%O 1,1

%A _Artur Jasinski_, Apr 21 2008

%E a(12) from _Ray Chandler_, Jun 16 2013

%E a(13)-a(17) from _Robert Price_, Mar 29 2017