A277705 Number of divisors in A260443(n).

1, 2, 2, 4, 2, 6, 4, 8, 2, 12, 6, 16, 4, 18, 8, 16, 2, 24, 12, 32, 6, 40, 16, 48, 4, 48, 18, 64, 8, 54, 16, 32, 2, 48, 24, 96, 12, 120, 32, 120, 6, 150, 40, 168, 16, 180, 48, 144, 4, 144, 48, 192, 18, 240, 64, 240, 8, 192, 54, 256, 16, 162, 32, 64, 2, 96, 48, 288, 24, 480, 96, 400, 12, 560, 120, 540, 32, 480, 120, 480, 6

Offset

0,2

Links

Antti Karttunen, Table of n, a(n) for n = 0..8192

Formula

a(n) = A000005(A260443(n)).

a(n) = A106737(A277020(n)).

Prog

(Scheme)
(define (A277705 n) (fold-left (lambda (a e) (* (+ 1 e) a)) 1 (A260443as_coeff_list n))) ;; A260443as_coeff_list given in A260443.

Crossrefs

Cf. A000005, A106737, A260443, A277020.

Cf. also A277325, A277326 (compare the scatter-plots).

Sequence in context: A278222 A286588 A334164 * A028913 A185048 A240828

Adjacent sequences: A277702 A277703 A277704 * A277706 A277707 A277708

Keyword

nonn,look

Author

Antti Karttunen, Oct 27 2016

Status

approved