OFFSET
1,3
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..1408 (terms 1..1000 from T. D. Noe using Blair Kelly's data)
Blair Kelly, Fibonacci and Lucas Factorizations.
Florian Luca, Arithmetic Functions of Fibonacci Numbers, The Fibonacci Quarterly, Vol. 37, No. 3 (1999), pp. 265-268.
FORMULA
a(n) <= A000045(A000203(n)), with equality if and only if n = 1 or 3 (Luca, 1999). - Amiram Eldar, Jan 12 2022
MATHEMATICA
DivisorSigma[1, Fibonacci@Range@40] (* Vladimir Reshetnikov, Nov 13 2015 *)
PROG
(PARI) j=[]; for(n=1, 50, j=concat(j, sigma(fibonacci(n)))); j
(Sage) [sigma(fibonacci(n), 1) for n in range(1, 38)] # Zerinvary Lajos, Jun 04 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 28 2001
STATUS
approved