1,2

Equals the inverse Mobius transform (A051731) of A127473 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 20 2008]

Multiplicative with a(p^e) = (p^(2*e)*(p-1)+2)/(p+1). - Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 19 2001

with(numtheory): A029939 := proc(n) local i, j; j := 0; for i in divisors(n) do j := j+phi(i)^2; od; j; end;

Cf. A062367.

A127473 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 20 2008]

Sequence in context: A101325 A042980 A048290 this_sequence A082198 A098871 A146477

Adjacent sequences: A029936 A029937 A029938 this_sequence A029940 A029941 A029942

nonn,mult

N. J. A. Sloane (njas(AT)research.att.com).