A256596 - cp's OEIS frontend

A256596 a(n) is the number of iterations of the map x->sigma(x) when starting from n before arriving at a number with more than one ancestor, with a(1)=0 and where sigma is the sum of divisors.

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

[0, 6, 5, 4, 2, 1, 3, 2, 3, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 4, 1, 1, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 1, 3, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1]

cp's OEIS Frontend

A256596 a(n) is the number of iterations of the map x->sigma(x) when starting from n before arriving at a number with more than one ancestor, with a(1)=0 and where sigma is the sum of divisors.

Table of values

List of values

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

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

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