A063972 - cp's OEIS frontend

A063972 a(n) is the smallest m such that usigma(m) = n (or 0 if no such m).

n	a(n)
1	1
2	0
3	2
4	3
5	4
6	5
7	0
8	7
9	8
10	9
11	0
12	6
13	0
14	13
15	0
16	0
17	16
18	10
19	0
20	12
21	0
22	0
23	0
24	14
25	0
26	25
27	0
28	27
29	0
30	18
31	0
32	21
33	32
34	0
35	0
36	22
37	0
38	37
39	0
40	28
41	0
42	26
43	0
44	43
45	0
46	0
47	0
48	33
49	0
50	36
51	0
52	0
53	0
54	34
55	0
56	39
57	0
58	0
59	0
60	38
61	0
62	61
63	0
64	0
65	64
66	0
67	0
68	48
69	0
70	52
71	0
72	30
73	0
74	73
75	0
76	0
77	0
78	50
79	0
80	57
81	0
82	81
83	0
84	54
85	0
86	0
87	0
88	0
89	0

[1, 0, 2, 3, 4, 5, 0, 7, 8, 9, 0, 6, 0, 13, 0, 0, 16, 10, 0, 12, 0, 0, 0, 14, 0, 25, 0, 27, 0, 18, 0, 21, 32, 0, 0, 22, 0, 37, 0, 28, 0, 26, 0, 43, 0, 0, 0, 33, 0, 36, 0, 0, 0, 34, 0, 39, 0, 0, 0, 38, 0, 61, 0, 0, 64, 0, 0, 48, 0, 52, 0, 30, 0, 73, 0, 0, 0, 50, 0, 57, 0, 81, 0, 54, 0, 0, 0, 0, 0]

cp's OEIS Frontend

A063972 a(n) is the smallest m such that usigma(m) = n (or 0 if no such m).

Table of values

List of values

n	a(n)
1	1
2	0
3	2
4	3
5	4
6	5
7	0
8	7
9	8
10	9
11	0
12	6
13	0
14	13
15	0
16	0
17	16
18	10
19	0
20	12
21	0
22	0
23	0
24	14
25	0
26	25
27	0
28	27
29	0
30	18
31	0
32	21
33	32
34	0
35	0
36	22
37	0
38	37
39	0
40	28
41	0
42	26
43	0
44	43
45	0
46	0
47	0
48	33
49	0
50	36
51	0
52	0
53	0
54	34
55	0
56	39
57	0
58	0
59	0
60	38
61	0
62	61
63	0
64	0
65	64
66	0
67	0
68	48
69	0
70	52
71	0
72	30
73	0
74	73
75	0
76	0
77	0
78	50
79	0
80	57
81	0
82	81
83	0
84	54
85	0
86	0
87	0
88	0
89	0

n	a(n)
1	1
2	0
3	2
4	3
5	4
6	5
7	0
8	7
9	8
10	9
11	0
12	6
13	0
14	13
15	0
16	0
17	16
18	10
19	0
20	12
21	0
22	0
23	0
24	14
25	0
26	25
27	0
28	27
29	0
30	18
31	0
32	21
33	32
34	0
35	0
36	22
37	0
38	37
39	0
40	28
41	0
42	26
43	0
44	43
45	0
46	0
47	0
48	33
49	0
50	36
51	0
52	0
53	0
54	34
55	0
56	39
57	0
58	0
59	0
60	38
61	0
62	61
63	0
64	0
65	64
66	0
67	0
68	48
69	0
70	52
71	0
72	30
73	0
74	73
75	0
76	0
77	0
78	50
79	0
80	57
81	0
82	81
83	0
84	54
85	0
86	0
87	0
88	0
89	0

n	a(n)
1	1
2	0
3	2
4	3
5	4
6	5
7	0
8	7
9	8
10	9
11	0
12	6
13	0
14	13
15	0
16	0
17	16
18	10
19	0
20	12
21	0
22	0
23	0
24	14
25	0
26	25
27	0
28	27
29	0
30	18
31	0
32	21
33	32
34	0
35	0
36	22
37	0
38	37
39	0
40	28
41	0
42	26
43	0
44	43
45	0
46	0
47	0
48	33
49	0
50	36
51	0
52	0
53	0
54	34
55	0
56	39
57	0
58	0
59	0
60	38
61	0
62	61
63	0
64	0
65	64
66	0
67	0
68	48
69	0
70	52
71	0
72	30
73	0
74	73
75	0
76	0
77	0
78	50
79	0
80	57
81	0
82	81
83	0
84	54
85	0
86	0
87	0
88	0
89	0