OFFSET
1,1
EXAMPLE
7 belongs to this sequence since 2*3*5*7+11 is divisible by 13.
PROG
(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); }
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Max Alekseyev, Feb 09 2005
EXTENSIONS
863833 from Ryan Propper, Jan 07 2008
STATUS
approved