A243473 - cp's OEIS frontend

A243473 a(n) = numerator(sigma(n)/n) - denominator(sigma(n)/n) where sigma(n) = sum of divisors of n.

n	a(n)
1	0
2	1
3	1
4	3
5	1
6	1
7	1
8	7
9	4
10	4
11	1
12	4
13	1
14	5
15	3
16	15
17	1
18	7
19	1
20	11
21	11
22	7
23	1
24	3
25	6
26	8
27	13
28	1
29	1
30	7
31	1
32	31
33	5
34	10
35	13
36	55
37	1
38	11
39	17
40	5
41	1
42	9
43	1
44	10
45	11
46	13
47	1
48	19
49	8
50	43
51	7
52	23
53	1
54	11
55	17
56	8
57	23
58	16
59	1
60	9
61	1
62	17
63	41
64	63
65	19
66	13
67	1
68	29
69	9
70	37
71	1
72	41
73	1
74	20
75	49
76	16

[0, 1, 1, 3, 1, 1, 1, 7, 4, 4, 1, 4, 1, 5, 3, 15, 1, 7, 1, 11, 11, 7, 1, 3, 6, 8, 13, 1, 1, 7, 1, 31, 5, 10, 13, 55, 1, 11, 17, 5, 1, 9, 1, 10, 11, 13, 1, 19, 8, 43, 7, 23, 1, 11, 17, 8, 23, 16, 1, 9, 1, 17, 41, 63, 19, 13, 1, 29, 9, 37, 1, 41, 1, 20, 49, 16]

cp's OEIS Frontend

A243473 a(n) = numerator(sigma(n)/n) - denominator(sigma(n)/n) where sigma(n) = sum of divisors of n.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	3
5	1
6	1
7	1
8	7
9	4
10	4
11	1
12	4
13	1
14	5
15	3
16	15
17	1
18	7
19	1
20	11
21	11
22	7
23	1
24	3
25	6
26	8
27	13
28	1
29	1
30	7
31	1
32	31
33	5
34	10
35	13
36	55
37	1
38	11
39	17
40	5
41	1
42	9
43	1
44	10
45	11
46	13
47	1
48	19
49	8
50	43
51	7
52	23
53	1
54	11
55	17
56	8
57	23
58	16
59	1
60	9
61	1
62	17
63	41
64	63
65	19
66	13
67	1
68	29
69	9
70	37
71	1
72	41
73	1
74	20
75	49
76	16

n	a(n)
1	0
2	1
3	1
4	3
5	1
6	1
7	1
8	7
9	4
10	4
11	1
12	4
13	1
14	5
15	3
16	15
17	1
18	7
19	1
20	11
21	11
22	7
23	1
24	3
25	6
26	8
27	13
28	1
29	1
30	7
31	1
32	31
33	5
34	10
35	13
36	55
37	1
38	11
39	17
40	5
41	1
42	9
43	1
44	10
45	11
46	13
47	1
48	19
49	8
50	43
51	7
52	23
53	1
54	11
55	17
56	8
57	23
58	16
59	1
60	9
61	1
62	17
63	41
64	63
65	19
66	13
67	1
68	29
69	9
70	37
71	1
72	41
73	1
74	20
75	49
76	16

n	a(n)
1	0
2	1
3	1
4	3
5	1
6	1
7	1
8	7
9	4
10	4
11	1
12	4
13	1
14	5
15	3
16	15
17	1
18	7
19	1
20	11
21	11
22	7
23	1
24	3
25	6
26	8
27	13
28	1
29	1
30	7
31	1
32	31
33	5
34	10
35	13
36	55
37	1
38	11
39	17
40	5
41	1
42	9
43	1
44	10
45	11
46	13
47	1
48	19
49	8
50	43
51	7
52	23
53	1
54	11
55	17
56	8
57	23
58	16
59	1
60	9
61	1
62	17
63	41
64	63
65	19
66	13
67	1
68	29
69	9
70	37
71	1
72	41
73	1
74	20
75	49
76	16