%I #5 Sep 24 2013 09:21:35
%S 2,7,103,229561,863833
%N Primes p(n) such that p(n)#+p(n+1) is divisible by p(n+2).
%e 7 belongs to this sequence since 2*3*5*7+11 is divisible by 13.
%o (PARI) { isgood(p) = local(r,p2,p3); p2=nextprime(p+1); p3=nextprime(p2+1); r=Mod(1,p3); forprime(q=1,p,r*=q); r+=p2; return(r==0); }
%Y Cf. A002110, A058233.
%K hard,more,nonn
%O 1,1
%A _Max Alekseyev_, Feb 09 2005
%E 863833 from _Ryan Propper_, Jan 07 2008
|