1,4

Here omega(n) means the number of prime factors of n counted without multiplicity. - Harvey P. Dale, Dec 12 2012

Table of n, a(n) for n=1..86.

a(n)=A062570(n)/A034444(n)

Multiplicative with a(2^e) = 2^(e-1) and a(p^e) = (p^e-p^(e-1))/2 for an odd prime p. - Vladeta Jovovic, Jan 15 2004

Table[EulerPhi[2n]/2^PrimeNu[n], {n, 90}] (* Harvey P. Dale, Dec 12 2012 *)

Sequence in context: A105809 A091594 A118032 * A066201 A303273 A193820

Adjacent sequences: A089689 A089690 A089691 * A089693 A089694 A089695

nonn,mult

Benoit Cloitre, Jan 06 2004

approved