1,2

(PARI) for(n=1, 10^6, x=sum(k=0, n, (-1)^k*k!); if(Mod(x, n)==0 && issquarefree(n), print(n)))

Sequence in context: A064233 A051952 A103188 this_sequence A018296 A033316 A099194

Adjacent sequences: A064389 A064390 A064391 this_sequence A064393 A064394 A064395

more,nonn

Jason Earls (zevi_35711(AT)yahoo.com), Sep 28 2001