1,3

Antti Karttunen, Table of n, a(n) for n = 1..10000 (based on Hans Havermann's prime signature data)

Index entries for sequences related to binary expansion of n

Index entries for sequences computed from indices in prime factorization

Index entries for sequences related to sigma(n)

a(1) = 0; for n > 1, a(n) = A000203(A048675(n)).

(PARI)

A048675(n) = { my(f = factor(n)); sum(k=1, #f~, f[k, 2]*2^primepi(f[k, 1]))/2; };

A324573(n) = if(1==n, 0, sigma(A048675(n)));

Cf. A000203, A048675, A324574, A324575.

Cf. also A277892, A322812, A323243.

Sequence in context: A085870 A336510 A332463 * A096633 A175482 A318261

Adjacent sequences: A324570 A324571 A324572 * A324574 A324575 A324576

nonn

Antti Karttunen, Mar 08 2019

approved