A272439 Sum of positive divisors of A000032(n).

3, 1, 4, 7, 8, 12, 39, 30, 48, 140, 168, 200, 576, 522, 1128, 2688, 2208, 3572, 12960, 9350, 17296, 44520, 54208, 64680, 158976, 186048, 361928, 809200, 826728, 1169400, 4131036, 3010350, 4876416, 13862800, 17256768, 23639040, 59720832, 54018522, 116538408, 251395200, 233917632, 370248452, 1319232096

Offset

0,1

Links

Amiram Eldar, Table of n, a(n) for n = 0..1000 (using Blair Kelly's data)

Blair Kelly, Fibonacci and Lucas Factorizations

Formula

a(n) = A000203(A000032(n)).

Example

a(2) = 4 because A000032(2) = 3 and A000203(3) = 4.

Mathematica

DivisorSigma[1, LucasL@ Range[0, 42]] (* Michael De Vlieger, Apr 29 2016 *)

Prog

(PARI) a(n) = sigma(fibonacci(n-1) + fibonacci(n+1));

Crossrefs

Cf. A000032, A000203.

Sequence in context: A193969 A169838 A249271 * A217151 A081255 A005371

Adjacent sequences: A272436 A272437 A272438 * A272440 A272441 A272442

Keyword

nonn

Author

Altug Alkan, Apr 29 2016

Status

approved