A330437 - cp's OEIS frontend

A330437 Length of trajectory of n under the map n -> n - 1 + n/gpf(n) or 0 if no fixed point is reached, where gpf(n) is the greatest prime factor of n.

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	1
8	2
9	2
10	2
11	1
12	3
13	1
14	3
15	2
16	2
17	1
18	2
19	1
20	2
21	2
22	2
23	1
24	2
25	2
26	5
27	4
28	2
29	1
30	4
31	1
32	2
33	4
34	4
35	3
36	2
37	1
38	3
39	2
40	2
41	1
42	2
43	1
44	2
45	2
46	2
47	1
48	3
49	3
50	2
51	2
52	3
53	1
54	2
55	2
56	3
57	2
58	2
59	1
60	2
61	1
62	3
63	2
64	4
65	3
66	2
67	1
68	2
69	2
70	2
71	1
72	4
73	1
74	3
75	2
76	2
77	2
78	2
79	1
80	4
81	2
82	2
83	1
84	4
85	2
86	3
87	2
88	4
89	1
90	2
91	2
92	4
93	4
94	4
95	3
96	2
97	1
98	3
99	2
100	4

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

cp's OEIS Frontend

A330437 Length of trajectory of n under the map n -> n - 1 + n/gpf(n) or 0 if no fixed point is reached, where gpf(n) is the greatest prime factor of n.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	1
8	2
9	2
10	2
11	1
12	3
13	1
14	3
15	2
16	2
17	1
18	2
19	1
20	2
21	2
22	2
23	1
24	2
25	2
26	5
27	4
28	2
29	1
30	4
31	1
32	2
33	4
34	4
35	3
36	2
37	1
38	3
39	2
40	2
41	1
42	2
43	1
44	2
45	2
46	2
47	1
48	3
49	3
50	2
51	2
52	3
53	1
54	2
55	2
56	3
57	2
58	2
59	1
60	2
61	1
62	3
63	2
64	4
65	3
66	2
67	1
68	2
69	2
70	2
71	1
72	4
73	1
74	3
75	2
76	2
77	2
78	2
79	1
80	4
81	2
82	2
83	1
84	4
85	2
86	3
87	2
88	4
89	1
90	2
91	2
92	4
93	4
94	4
95	3
96	2
97	1
98	3
99	2
100	4

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	1
8	2
9	2
10	2
11	1
12	3
13	1
14	3
15	2
16	2
17	1
18	2
19	1
20	2
21	2
22	2
23	1
24	2
25	2
26	5
27	4
28	2
29	1
30	4
31	1
32	2
33	4
34	4
35	3
36	2
37	1
38	3
39	2
40	2
41	1
42	2
43	1
44	2
45	2
46	2
47	1
48	3
49	3
50	2
51	2
52	3
53	1
54	2
55	2
56	3
57	2
58	2
59	1
60	2
61	1
62	3
63	2
64	4
65	3
66	2
67	1
68	2
69	2
70	2
71	1
72	4
73	1
74	3
75	2
76	2
77	2
78	2
79	1
80	4
81	2
82	2
83	1
84	4
85	2
86	3
87	2
88	4
89	1
90	2
91	2
92	4
93	4
94	4
95	3
96	2
97	1
98	3
99	2
100	4

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	1
8	2
9	2
10	2
11	1
12	3
13	1
14	3
15	2
16	2
17	1
18	2
19	1
20	2
21	2
22	2
23	1
24	2
25	2
26	5
27	4
28	2
29	1
30	4
31	1
32	2
33	4
34	4
35	3
36	2
37	1
38	3
39	2
40	2
41	1
42	2
43	1
44	2
45	2
46	2
47	1
48	3
49	3
50	2
51	2
52	3
53	1
54	2
55	2
56	3
57	2
58	2
59	1
60	2
61	1
62	3
63	2
64	4
65	3
66	2
67	1
68	2
69	2
70	2
71	1
72	4
73	1
74	3
75	2
76	2
77	2
78	2
79	1
80	4
81	2
82	2
83	1
84	4
85	2
86	3
87	2
88	4
89	1
90	2
91	2
92	4
93	4
94	4
95	3
96	2
97	1
98	3
99	2
100	4