A241954 - cp's OEIS frontend

A241954 Number of integers x such that the repeated application of sigma(x)->x leads to n.

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

[1, 0, 1, 2, 0, 1, 3, 4, 0, 0, 0, 3, 1, 2, 5, 0, 0, 2, 0, 1, 0, 0, 0, 10, 0, 0, 0, 4, 0, 1, 2, 4, 0, 0, 0, 1, 0, 1, 3, 1, 0, 4, 0, 1, 0, 0, 0, 3, 0, 0, 0, 0, 0, 2, 0, 9, 1, 0, 0, 14, 0, 1, 5, 0, 0, 0, 0, 1, 0, 0, 0, 6, 0, 1, 0, 0, 0, 1, 0, 3, 0, 0, 0, 4, 0, 0]

cp's OEIS Frontend

A241954 Number of integers x such that the repeated application of sigma(x)->x leads to n.

Table of values

List of values

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

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

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