OFFSET
1,2
EXAMPLE
The 8th prime, 19, divides 2*3*5*7*11*13*17+1=510511, thus a(7)=1.
PROG
(PARI) for(n=1, 100, p=1; forprime(k=2, prime(n), p=p*k); pn=prime(n+1); s=0; while((s+1)%pn>0, s=s+p); print1(s/p", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Ralf Stephan, Mar 24 2003
STATUS
approved