A078681 - cp's OEIS frontend

A078681 Start with n; iterate the process x -> ceiling(3x/2) until reach a prime. Sequence gives number of steps to reach a prime or 0 if no prime is ever reached.

n	a(n)
1	1
2	1
3	1
4	53
5	5
6	52
7	1
8	4
9	51
10	2
11	1
12	3
13	39
14	50
15	1
16	162
17	3
18	2
19	1
20	38
21	49
22	4
23	2
24	161
25	50
26	2
27	1
28	52
29	4
30	37
31	1
32	48
33	3
34	13
35	1
36	160
37	9
38	49
39	1
40	8
41	42
42	51
43	18
44	3
45	36
46	8
47	1
48	47
49	3
50	2
51	12
52	35
53	27
54	159
55	1
56	8
57	48
58	2
59	1
60	7
61	4
62	41
63	50
64	16
65	17
66	2
67	1
68	35
69	7
70	13
71	1
72	46
73	11
74	2
75	1
76	3
77	11
78	34
79	2
80	26
81	158
82	7
83	6
84	7

[1, 1, 1, 53, 5, 52, 1, 4, 51, 2, 1, 3, 39, 50, 1, 162, 3, 2, 1, 38, 49, 4, 2, 161, 50, 2, 1, 52, 4, 37, 1, 48, 3, 13, 1, 160, 9, 49, 1, 8, 42, 51, 18, 3, 36, 8, 1, 47, 3, 2, 12, 35, 27, 159, 1, 8, 48, 2, 1, 7, 4, 41, 50, 16, 17, 2, 1, 35, 7, 13, 1, 46, 11, 2, 1, 3, 11, 34, 2, 26, 158, 7, 6, 7]

cp's OEIS Frontend

A078681 Start with n; iterate the process x -> ceiling(3x/2) until reach a prime. Sequence gives number of steps to reach a prime or 0 if no prime is ever reached.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	53
5	5
6	52
7	1
8	4
9	51
10	2
11	1
12	3
13	39
14	50
15	1
16	162
17	3
18	2
19	1
20	38
21	49
22	4
23	2
24	161
25	50
26	2
27	1
28	52
29	4
30	37
31	1
32	48
33	3
34	13
35	1
36	160
37	9
38	49
39	1
40	8
41	42
42	51
43	18
44	3
45	36
46	8
47	1
48	47
49	3
50	2
51	12
52	35
53	27
54	159
55	1
56	8
57	48
58	2
59	1
60	7
61	4
62	41
63	50
64	16
65	17
66	2
67	1
68	35
69	7
70	13
71	1
72	46
73	11
74	2
75	1
76	3
77	11
78	34
79	2
80	26
81	158
82	7
83	6
84	7

n	a(n)
1	1
2	1
3	1
4	53
5	5
6	52
7	1
8	4
9	51
10	2
11	1
12	3
13	39
14	50
15	1
16	162
17	3
18	2
19	1
20	38
21	49
22	4
23	2
24	161
25	50
26	2
27	1
28	52
29	4
30	37
31	1
32	48
33	3
34	13
35	1
36	160
37	9
38	49
39	1
40	8
41	42
42	51
43	18
44	3
45	36
46	8
47	1
48	47
49	3
50	2
51	12
52	35
53	27
54	159
55	1
56	8
57	48
58	2
59	1
60	7
61	4
62	41
63	50
64	16
65	17
66	2
67	1
68	35
69	7
70	13
71	1
72	46
73	11
74	2
75	1
76	3
77	11
78	34
79	2
80	26
81	158
82	7
83	6
84	7

n	a(n)
1	1
2	1
3	1
4	53
5	5
6	52
7	1
8	4
9	51
10	2
11	1
12	3
13	39
14	50
15	1
16	162
17	3
18	2
19	1
20	38
21	49
22	4
23	2
24	161
25	50
26	2
27	1
28	52
29	4
30	37
31	1
32	48
33	3
34	13
35	1
36	160
37	9
38	49
39	1
40	8
41	42
42	51
43	18
44	3
45	36
46	8
47	1
48	47
49	3
50	2
51	12
52	35
53	27
54	159
55	1
56	8
57	48
58	2
59	1
60	7
61	4
62	41
63	50
64	16
65	17
66	2
67	1
68	35
69	7
70	13
71	1
72	46
73	11
74	2
75	1
76	3
77	11
78	34
79	2
80	26
81	158
82	7
83	6
84	7