1,1
The list is complete to 102. 200 and 392 are also to be included.
Paul Leyland, Generalized Cullen and Woodall numbers
Andrew Walker, N!+/-1 Factoring Page
(PARI) {A064147(n)=if(numdiv(n!-1)==numdiv(n!+1), n, 0)}
Cf. A000005.
Sequence in context: A080892 A177091 A074186 * A122529 A137920 A126581
Adjacent sequences: A064144 A064145 A064146 * A064148 A064149 A064150
nonn
Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 11 2001
More terms from Randall L. Rathbun, Jan 11 2002