1,3

Eric Weisstein's World of Mathematics, Smarandache Function

a(n) = A027423(n)-A027423(n-1) = A000005(A000142(n))-A000005(A000142(n-1)) i.e. number of divisors of n! which are not divisors of (n-1)! [for n>1]. - Henry Bottomley (se16(AT)btinternet.com), Oct 22 2001

Cf. A046021.

Sequence in context: A018086 A004651 A118560 this_sequence A061297 A130711 A093483

Adjacent sequences: A038021 A038022 A038023 this_sequence A038025 A038026 A038027

nonn

Christian G. Bower (bowerc(AT)usa.net)