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
Keywords
Examples
a(2) = 4 because A000032(2) = 3 and A000203(3) = 4.
Links
- Amiram Eldar, Table of n, a(n) for n = 0..1000 (using Blair Kelly's data)
- Blair Kelly, Fibonacci and Lucas Factorizations
Programs
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Mathematica
DivisorSigma[1, LucasL@ Range[0, 42]] (* Michael De Vlieger, Apr 29 2016 *)
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PARI
a(n) = sigma(fibonacci(n-1) + fibonacci(n+1));