A216189 - cp's OEIS frontend

A216189 Numbers n whose odd Collatz steps (except for 1) are all primes.

n	a(n)
1	3
2	5
3	6
4	7
5	9
6	10
7	11
8	12
9	13
10	14
11	17
12	19
13	20
14	21
15	22
16	24
17	25
18	26
19	28
20	29
21	34
22	35
23	37
24	38
25	39
26	40
27	44
28	45
29	48
30	49
31	52
32	53
33	56
34	58
35	59
36	67
37	68
38	69
39	74
40	76
41	77
42	80
43	85
44	87
45	88
46	89
47	96
48	99
49	101
50	104
51	106
52	112
53	116
54	117
55	118
56	119
57	131
58	134
59	136
60	141
61	148
62	149

[3, 5, 6, 7, 9, 10, 11, 12, 13, 14, 17, 19, 20, 21, 22, 24, 25, 26, 28, 29, 34, 35, 37, 38, 39, 40, 44, 45, 48, 49, 52, 53, 56, 58, 59, 67, 68, 69, 74, 76, 77, 80, 85, 87, 88, 89, 96, 99, 101, 104, 106, 112, 116, 117, 118, 119, 131, 134, 136, 141, 148, 149]

cp's OEIS Frontend

A216189 Numbers n whose odd Collatz steps (except for 1) are all primes.

Table of values

List of values

n	a(n)
1	3
2	5
3	6
4	7
5	9
6	10
7	11
8	12
9	13
10	14
11	17
12	19
13	20
14	21
15	22
16	24
17	25
18	26
19	28
20	29
21	34
22	35
23	37
24	38
25	39
26	40
27	44
28	45
29	48
30	49
31	52
32	53
33	56
34	58
35	59
36	67
37	68
38	69
39	74
40	76
41	77
42	80
43	85
44	87
45	88
46	89
47	96
48	99
49	101
50	104
51	106
52	112
53	116
54	117
55	118
56	119
57	131
58	134
59	136
60	141
61	148
62	149

n	a(n)
1	3
2	5
3	6
4	7
5	9
6	10
7	11
8	12
9	13
10	14
11	17
12	19
13	20
14	21
15	22
16	24
17	25
18	26
19	28
20	29
21	34
22	35
23	37
24	38
25	39
26	40
27	44
28	45
29	48
30	49
31	52
32	53
33	56
34	58
35	59
36	67
37	68
38	69
39	74
40	76
41	77
42	80
43	85
44	87
45	88
46	89
47	96
48	99
49	101
50	104
51	106
52	112
53	116
54	117
55	118
56	119
57	131
58	134
59	136
60	141
61	148
62	149

n	a(n)
1	3
2	5
3	6
4	7
5	9
6	10
7	11
8	12
9	13
10	14
11	17
12	19
13	20
14	21
15	22
16	24
17	25
18	26
19	28
20	29
21	34
22	35
23	37
24	38
25	39
26	40
27	44
28	45
29	48
30	49
31	52
32	53
33	56
34	58
35	59
36	67
37	68
38	69
39	74
40	76
41	77
42	80
43	85
44	87
45	88
46	89
47	96
48	99
49	101
50	104
51	106
52	112
53	116
54	117
55	118
56	119
57	131
58	134
59	136
60	141
61	148
62	149