A276811 - cp's OEIS frontend

A276811 a(n) = sigma(Fibonacci(k))/Fibonacci(n) where k is the least number such that Fibonacci(n) divides sigma(Fibonacci(k)), or -1 if no such k exists.

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	4
7	31
8	20
9	47
10	5832
11	322
12	84
13	4576568315415066934826490
14	324
15	843
16	480
17	3769607182320
18	2209
19	707932145558030519866865515025923563263974776037874477588352
20	69670959389872974262939756520
21	39603

[1, 1, 2, 1, 3, 4, 31, 20, 47, 5832, 322, 84, 4576568315415066934826490, 324, 843, 480, 3769607182320, 2209, 707932145558030519866865515025923563263974776037874477588352, 69670959389872974262939756520, 39603]

cp's OEIS Frontend

A276811 a(n) = sigma(Fibonacci(k))/Fibonacci(n) where k is the least number such that Fibonacci(n) divides sigma(Fibonacci(k)), or -1 if no such k exists.

Table of values

List of values