A293982 - cp's OEIS frontend

A293982 Length (= size) of the orbit of n under iterations of A293975: x -> x/2 if even, x + nextprime(x) if odd; or -1 if the orbit is infinite.

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

[1, 5, 5, 5, 5, 8, 6, 13, 5, 11, 9, 9, 7, 10, 14, 8, 6, 14, 12, 14, 10, 12, 10, 13, 8, 19, 11, 17, 15, 11, 9, 17, 7, 17, 15, 15, 13, 15, 15, 13, 11, 15, 13, 18, 11, 16, 14, 22, 9, 16, 20, 14, 12, 18, 18, 16, 16, 14, 12, 12, 10, 10, 18, 22, 8, 20, 18, 20, 16, 18, 16, 16, 14]

cp's OEIS Frontend

A293982 Length (= size) of the orbit of n under iterations of A293975: x -> x/2 if even, x + nextprime(x) if odd; or -1 if the orbit is infinite.

Table of values

List of values

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

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

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