A131672 - cp's OEIS frontend

A131672 a(n) is the smallest k >= 1 such that the expansion of the inverse of the k-th cyclotomic polynomial has n or -n as a coefficient, or -1 if no such k exists.

n	a(n)
1	1
2	561
3	1155
4	2145
5	3795
6	5005
7	5005
8	8645
9	8645
10	11305
11	11305
12	11305
13	11305
14	11305
15	11305
16	11305
17	11305
18	11305
19	11305
20	11305
21	11305
22	31395
23	31395
24	31395
25	31395
26	31395
27	33495
28	33495
29	33495
30	33495
31	33495
32	33495
33	33495
34	33495
35	33495
36	33495
37	33495
38	33495
39	40755

[1, 561, 1155, 2145, 3795, 5005, 5005, 8645, 8645, 11305, 11305, 11305, 11305, 11305, 11305, 11305, 11305, 11305, 11305, 11305, 11305, 31395, 31395, 31395, 31395, 31395, 33495, 33495, 33495, 33495, 33495, 33495, 33495, 33495, 33495, 33495, 33495, 33495, 40755]

cp's OEIS Frontend

A131672 a(n) is the smallest k >= 1 such that the expansion of the inverse of the k-th cyclotomic polynomial has n or -n as a coefficient, or -1 if no such k exists.

Table of values

List of values