

A139444


Numbers n such that primorial(n)/2  16 is prime.


5



4, 7, 9, 13, 22, 26, 30, 33, 36, 38, 42, 114, 125, 126, 181, 291, 296, 386, 1415, 2573, 3727, 5574, 7523, 8682, 9765
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OFFSET

1,1


COMMENTS

a(26) > 25000.  Robert Price, Feb 25 2017


LINKS

Table of n, a(n) for n=1..25.


MATHEMATICA

k = 1; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k  16] && k>16, Print[n]; AppendTo[a, n]], {n, 2, 752}]; a


CROSSREFS

Cf. A067026, A067027, A139439A139457, A103514.
Sequence in context: A310963 A082869 A320691 * A166569 A024608 A287111
Adjacent sequences: A139441 A139442 A139443 * A139445 A139446 A139447


KEYWORD

nonn,more


AUTHOR

Artur Jasinski, Apr 21 2008


EXTENSIONS

Drop 2 and correct program, a(16)a(20) from Ray Chandler, Jun 16 2013
a(21)a(25) from Robert Price, Feb 25 2017


STATUS

approved



