A331032 - cp's OEIS frontend

A331032 Number of iterations of n -> n + gpf(n) needed for the trajectory of n to join the trajectory of A076271, where gpf(n) is the greatest prime factor of n.

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

[0, 0, 1, 0, 2, 0, 4, 2, 0, 1, 6, 0, 10, 3, 0, 4, 12, 3, 16, 0, 2, 5, 18, 2, 0, 9, 1, 1, 22, 0, 28, 12, 4, 11, 0, 9, 30, 15, 8, 5, 36, 0, 40, 3, 4, 17, 42, 11, 0, 3, 10, 7, 46, 15, 2, 0, 14, 21, 52, 7, 58, 27, 0, 2, 6, 1, 60, 9, 16, 0, 66, 11, 70, 29, 10, 13]

cp's OEIS Frontend

A331032 Number of iterations of n -> n + gpf(n) needed for the trajectory of n to join the trajectory of A076271, where gpf(n) is the greatest prime factor of n.

Table of values

List of values

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

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

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