A375513 - cp's OEIS frontend

A375513 Irregular triangle read by rows in which row n lists the iterates of the sigma_0(x) map starting at n, until a fixed point is reached, where sigma_0(x) is the number-of-divisors function (A000005).

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

[1, 2, 3, 2, 4, 3, 2, 5, 2, 6, 4, 3, 2, 7, 2, 8, 4, 3, 2, 9, 3, 2, 10, 4, 3, 2, 11, 2, 12, 6, 4, 3, 2, 13, 2, 14, 4, 3, 2, 15, 4, 3, 2, 16, 5, 2, 17, 2, 18, 6, 4, 3, 2, 19, 2, 20, 6, 4, 3, 2, 21, 4, 3, 2, 22, 4, 3, 2, 23, 2, 24, 8, 4, 3, 2, 25, 3, 2, 26, 4, 3, 2]

cp's OEIS Frontend

A375513 Irregular triangle read by rows in which row n lists the iterates of the sigma_0(x) map starting at n, until a fixed point is reached, where sigma_0(x) is the number-of-divisors function (A000005).

Table of values

List of values

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

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

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