A280929 - cp's OEIS frontend

A280929 Number of steps required to reach the first prime when starting from n in the Collatz (or '3x+1') problem.

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

[2, 3, 2, 1, 4, 1, 2, 2, 3, 1, 2, 2, 4, 1, 2, 3, 3, 4, 2, 2, 6, 1, 4, 3, 3, 1, 2, 2, 4, 3, 2, 4, 6, 1, 2, 5, 5, 1, 2, 3, 3, 7, 8, 2, 4, 1, 2, 4, 3, 4, 6, 2, 6, 3, 2, 3, 3, 1, 2, 4, 4, 1, 17, 5, 6, 7, 2, 2, 5, 3, 2, 6, 5, 1, 2, 2, 4, 3, 4, 4, 3, 1, 6, 8, 8, 1, 2, 3, 3, 5, 2, 2, 6, 1, 15, 5, 3, 4, 2, 5]

cp's OEIS Frontend

A280929 Number of steps required to reach the first prime when starting from n in the Collatz (or '3x+1') problem.

Table of values

List of values

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

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

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