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

Author

Antti Karttunen, Oct 27 2016

Keywords

• nonn
• look

Links

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

Crossrefs

Cf. A000005, A106737, A260443, A277020.

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

Programs

Scheme

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

Formula

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

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