A211178 - cp's OEIS frontend

A211178 Denominator of Sum_{k=1..n}(-1)^k/phi(k), where phi = A000010.

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	4
7	12
8	3
9	6
10	12
11	60
12	30
13	60
14	20
15	40
16	20
17	80
18	240
19	720
20	720
21	720
22	144
23	1584
24	1584
25	7920
26	7920
27	7920
28	7920
29	55440
30	55440
31	11088
32	5544
33	27720
34	55440
35	55440
36	55440
37	55440
38	6160
39	18480
40	2310
41	9240
42	9240
43	3080
44	3080
45	1155
46	210
47	2415
48	38640
49	5520
50	5520

[1, 1, 2, 1, 4, 4, 12, 3, 6, 12, 60, 30, 60, 20, 40, 20, 80, 240, 720, 720, 720, 144, 1584, 1584, 7920, 7920, 7920, 7920, 55440, 55440, 11088, 5544, 27720, 55440, 55440, 55440, 55440, 6160, 18480, 2310, 9240, 9240, 3080, 3080, 1155, 210, 2415, 38640, 5520, 5520]

cp's OEIS Frontend

A211178 Denominator of Sum_{k=1..n}(-1)^k/phi(k), where phi = A000010.

Table of values

List of values