1,2

Multiplicative with a(p^e) = (2*(p-1))^e. If n = Product p(k)^e(k) then a(n) = Product (2*(p(k)-1)^e(k). a(n) = A061142(n) * A003958(n) = 2^bigomega(n) * A003958(n) = 2^A001222(n) * A003958(n).

Sequence in context: A034583 A076347 A140513 this_sequence A116596 A048656 A107848

Adjacent sequences: A166629 A166630 A166631 this_sequence A166633 A166634 A166635

nonn

Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Oct 18 2009