A319068 - cp's OEIS frontend

A319068 a(n) is the greatest k such that A000203(k) divides n where A000203 is the sum of divisors of n.

n	a(n)
1	1
2	1
3	2
4	3
5	1
6	5
7	4
8	7
9	2
10	1
11	1
12	11
13	9
14	13
15	8
16	7
17	1
18	17
19	1
20	19
21	4
22	1
23	1
24	23
25	1
26	9
27	2
28	13
29	1
30	29
31	25
32	31
33	2
34	1
35	4
36	22
37	1
38	37
39	18
40	27
41	1
42	41
43	1
44	43
45	8
46	1
47	1
48	47
49	4
50	1
51	2
52	9
53	1
54	53
55	1
56	39
57	49
58	1
59	1
60	59
61	1
62	61
63	32
64	31
65	9
66	5
67	1
68	67
69	2
70	13
71	1
72	71
73	1
74	73
75	8
76	37
77	4
78	45
79	1
80	79

[1, 1, 2, 3, 1, 5, 4, 7, 2, 1, 1, 11, 9, 13, 8, 7, 1, 17, 1, 19, 4, 1, 1, 23, 1, 9, 2, 13, 1, 29, 25, 31, 2, 1, 4, 22, 1, 37, 18, 27, 1, 41, 1, 43, 8, 1, 1, 47, 4, 1, 2, 9, 1, 53, 1, 39, 49, 1, 1, 59, 1, 61, 32, 31, 9, 5, 1, 67, 2, 13, 1, 71, 1, 73, 8, 37, 4, 45, 1, 79]

cp's OEIS Frontend

A319068 a(n) is the greatest k such that A000203(k) divides n where A000203 is the sum of divisors of n.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	3
5	1
6	5
7	4
8	7
9	2
10	1
11	1
12	11
13	9
14	13
15	8
16	7
17	1
18	17
19	1
20	19
21	4
22	1
23	1
24	23
25	1
26	9
27	2
28	13
29	1
30	29
31	25
32	31
33	2
34	1
35	4
36	22
37	1
38	37
39	18
40	27
41	1
42	41
43	1
44	43
45	8
46	1
47	1
48	47
49	4
50	1
51	2
52	9
53	1
54	53
55	1
56	39
57	49
58	1
59	1
60	59
61	1
62	61
63	32
64	31
65	9
66	5
67	1
68	67
69	2
70	13
71	1
72	71
73	1
74	73
75	8
76	37
77	4
78	45
79	1
80	79

n	a(n)
1	1
2	1
3	2
4	3
5	1
6	5
7	4
8	7
9	2
10	1
11	1
12	11
13	9
14	13
15	8
16	7
17	1
18	17
19	1
20	19
21	4
22	1
23	1
24	23
25	1
26	9
27	2
28	13
29	1
30	29
31	25
32	31
33	2
34	1
35	4
36	22
37	1
38	37
39	18
40	27
41	1
42	41
43	1
44	43
45	8
46	1
47	1
48	47
49	4
50	1
51	2
52	9
53	1
54	53
55	1
56	39
57	49
58	1
59	1
60	59
61	1
62	61
63	32
64	31
65	9
66	5
67	1
68	67
69	2
70	13
71	1
72	71
73	1
74	73
75	8
76	37
77	4
78	45
79	1
80	79

n	a(n)
1	1
2	1
3	2
4	3
5	1
6	5
7	4
8	7
9	2
10	1
11	1
12	11
13	9
14	13
15	8
16	7
17	1
18	17
19	1
20	19
21	4
22	1
23	1
24	23
25	1
26	9
27	2
28	13
29	1
30	29
31	25
32	31
33	2
34	1
35	4
36	22
37	1
38	37
39	18
40	27
41	1
42	41
43	1
44	43
45	8
46	1
47	1
48	47
49	4
50	1
51	2
52	9
53	1
54	53
55	1
56	39
57	49
58	1
59	1
60	59
61	1
62	61
63	32
64	31
65	9
66	5
67	1
68	67
69	2
70	13
71	1
72	71
73	1
74	73
75	8
76	37
77	4
78	45
79	1
80	79