A178641 Primes p such that primorial(p)/2 + 2 is composite.
11, 17, 19, 23, 41, 43, 53, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 311, 313, 317, 331, 337
Offset: 1
Keywords
Examples
3*5*7*11 + 2 = 13*89 is composite.
Programs
-
Mathematica
pp=1;lst={};Do[p=Prime[n];pp*=p;If[ !PrimeQ[pp+2],AppendTo[lst,p]],{n,2,2*5!}];lst