A078551 - cp's OEIS frontend

A078551 Largest prime dividing sigma(2,n).

n	a(n)
2	5
3	5
4	7
5	13
6	5
7	5
8	17
9	13
10	13
11	61
12	7
13	17
14	5
15	13
16	31
17	29
18	13
19	181
20	13
21	5
22	61
23	53
24	17
25	31
26	17
27	41
28	7
29	421
30	13
31	37
32	13
33	61
34	29
35	13
36	13
37	137
38	181
39	17
40	17
41	29
42	5
43	37
44	61
45	13
46	53
47	17
48	31
49	43
50	31
51	29
52	17
53	281
54	41
55	61
56	17
57	181
58	421
59	1741
60	13
61	1861
62	37
63	13
64	127
65	17
66	61
67	449
68	29
69	53

[5, 5, 7, 13, 5, 5, 17, 13, 13, 61, 7, 17, 5, 13, 31, 29, 13, 181, 13, 5, 61, 53, 17, 31, 17, 41, 7, 421, 13, 37, 13, 61, 29, 13, 13, 137, 181, 17, 17, 29, 5, 37, 61, 13, 53, 17, 31, 43, 31, 29, 17, 281, 41, 61, 17, 181, 421, 1741, 13, 1861, 37, 13, 127, 17, 61, 449, 29, 53]

cp's OEIS Frontend

A078551 Largest prime dividing sigma(2,n).

Table of values

List of values