A272439 - OEIS

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A272439

Sum of positive divisors of A000032(n).

2

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

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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