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Numbers n such that (p(n)#)*(4*(p(n)#)+1)-1 is prime, where p(i)# = i-th primorial.
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%I #3 Mar 31 2012 13:22:04

%S 1,2,4,6,7,17,23,34,201,706,1413,2265

%N Numbers n such that (p(n)#)*(4*(p(n)#)+1)-1 is prime, where p(i)# = i-th primorial.

%K nonn

%O 1,2

%A _Pierre CAMI_, Apr 11 2005