1,5

Table of n, a(n) for n=1..74.

a(n)=A007814(A048855(n))-A007814(n!)= A007814(A048855(n))-A011371(A000142(n))

n=8, 8!=40320=128*315, Phi(40320)=9216=9*1024 Exponent of 2 in 8! is only 7, in Phi(8!) is 10 so a(8)=10-7=3 Exponents of 2 is larger in Phi(n!) than in n! if n>4.

A000142, A000010, A048855, A007814, A011371.

Sequence in context: A241139 A294242 A241092 * A078571 A194343 A071860

Adjacent sequences: A055653 A055654 A055655 * A055657 A055658 A055659

sign

Labos Elemer, Jul 11 2000

approved