OFFSET
1,1
COMMENTS
If n is a prime or a semiprime, a(n) gives the number of divisors of n.
LINKS
EXAMPLE
a(6) = 4; mu(6) + 3 = 1 + 3 = 4.
MAPLE
with(numtheory); a:=n->mobius(n)+3; seq(a(n), n=1..100);
MATHEMATICA
Table[MoebiusMu[n] + 3, {n, 100}]
PROG
(PARI) a(n) = moebius(n) + 3; \\ Michel Marcus, Nov 14 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wesley Ivan Hurt, Nov 13 2013
STATUS
approved