A374192 - cp's OEIS frontend

A374192 Number of iterations required to reach 1 or 10 in a modified Collatz trajectory where x -> x/2 if x is even, x -> x+1 if x is odd and not divisible by 3 and x -> 3x+1 if x is odd and divisible by 3; or a(n) = -1 if 1 or 10 is never reached.

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

[0, 1, 1, 2, 3, 2, 4, 3, 7, 0, 4, 3, 6, 5, 7, 4, 9, 8, 2, 1, 7, 5, 5, 4, 8, 7, 11, 6, 9, 8, 6, 5, 11, 10, 10, 9, 4, 3, 12, 2, 9, 8, 7, 6, 13, 6, 6, 5, 10, 9, 16, 8, 13, 12, 8, 7, 10, 10, 10, 9, 8, 7, 9, 6, 13, 12, 12, 11, 11, 11, 11, 10, 6, 5, 14, 4, 14, 13, 4, 3]

cp's OEIS Frontend

A374192 Number of iterations required to reach 1 or 10 in a modified Collatz trajectory where x -> x/2 if x is even, x -> x+1 if x is odd and not divisible by 3 and x -> 3x+1 if x is odd and divisible by 3; or a(n) = -1 if 1 or 10 is never reached.

Table of values

List of values

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

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

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