1,1

(PARI) f(n) = sum(k=0, n-1, k!); for(n=1, 10^6, if(isprime(f(n)+eulerphi(n)-1), print(n)))

Cf. A003422.

Sequence in context: A118968 A073528 A116067 this_sequence A006481 A118597 A083160

Adjacent sequences: A063682 A063683 A063684 this_sequence A063686 A063687 A063688

more,nonn

Jason Earls (zevi_35711(AT)yahoo.com), Aug 22 2001