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A272377
Number of positive divisors of A000032(n).
2
2, 1, 2, 3, 2, 2, 6, 2, 2, 6, 4, 2, 8, 2, 4, 12, 2, 2, 16, 2, 4, 12, 8, 4, 8, 8, 4, 12, 6, 4, 24, 2, 4, 12, 8, 16, 16, 2, 4, 24, 8, 2, 48, 4, 16, 96, 8, 2, 16, 4, 16, 24, 8, 2, 40, 24, 4, 24, 8, 8, 64, 2, 4, 96, 4, 32, 48, 4, 4, 48, 16, 2, 16, 4, 8, 192, 4, 16, 24, 2, 4, 48, 16, 4, 96, 16, 4, 48, 8, 4, 128
OFFSET
0,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 0..1000 (using Blair Kelly's data)
FORMULA
a(n) = A000005(A000032(n)).
EXAMPLE
a(3) = 3 because A000032(3) = 4 and 4 is divisible by 1, 2 and 4.
MATHEMATICA
DivisorSigma[0, LucasL /@ Range[0, 90]] (* Michael De Vlieger, Apr 28 2016 *)
PROG
(PARI) a(n) = numdiv(fibonacci(n-1)+fibonacci(n+1));
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Altug Alkan, Apr 28 2016
STATUS
approved