A225105 - cp's OEIS frontend

A225105 Odd numbers n such that the largest odd term in Collatz(3x+1) trajectory of n is prime.

n	a(n)
1	3
2	5
3	7
4	9
5	11
6	13
7	15
8	17
9	19
10	23
11	25
12	29
13	35
14	37
15	39
16	53
17	59
18	61
19	67
20	75
21	79
22	87
23	89
24	99
25	101
26	105
27	113
28	115
29	119
30	131
31	149
32	153
33	157
34	173
35	179
36	181
37	187
38	197
39	211
40	219
41	229
42	241
43	247
44	249
45	255
46	267
47	269
48	277
49	281
50	307
51	317
52	329
53	349
54	371
55	373
56	383
57	397

[3, 5, 7, 9, 11, 13, 15, 17, 19, 23, 25, 29, 35, 37, 39, 53, 59, 61, 67, 75, 79, 87, 89, 99, 101, 105, 113, 115, 119, 131, 149, 153, 157, 173, 179, 181, 187, 197, 211, 219, 229, 241, 247, 249, 255, 267, 269, 277, 281, 307, 317, 329, 349, 371, 373, 383, 397]

cp's OEIS Frontend

A225105 Odd numbers n such that the largest odd term in Collatz(3x+1) trajectory of n is prime.

Table of values

List of values

n	a(n)
1	3
2	5
3	7
4	9
5	11
6	13
7	15
8	17
9	19
10	23
11	25
12	29
13	35
14	37
15	39
16	53
17	59
18	61
19	67
20	75
21	79
22	87
23	89
24	99
25	101
26	105
27	113
28	115
29	119
30	131
31	149
32	153
33	157
34	173
35	179
36	181
37	187
38	197
39	211
40	219
41	229
42	241
43	247
44	249
45	255
46	267
47	269
48	277
49	281
50	307
51	317
52	329
53	349
54	371
55	373
56	383
57	397

n	a(n)
1	3
2	5
3	7
4	9
5	11
6	13
7	15
8	17
9	19
10	23
11	25
12	29
13	35
14	37
15	39
16	53
17	59
18	61
19	67
20	75
21	79
22	87
23	89
24	99
25	101
26	105
27	113
28	115
29	119
30	131
31	149
32	153
33	157
34	173
35	179
36	181
37	187
38	197
39	211
40	219
41	229
42	241
43	247
44	249
45	255
46	267
47	269
48	277
49	281
50	307
51	317
52	329
53	349
54	371
55	373
56	383
57	397

n	a(n)
1	3
2	5
3	7
4	9
5	11
6	13
7	15
8	17
9	19
10	23
11	25
12	29
13	35
14	37
15	39
16	53
17	59
18	61
19	67
20	75
21	79
22	87
23	89
24	99
25	101
26	105
27	113
28	115
29	119
30	131
31	149
32	153
33	157
34	173
35	179
36	181
37	187
38	197
39	211
40	219
41	229
42	241
43	247
44	249
45	255
46	267
47	269
48	277
49	281
50	307
51	317
52	329
53	349
54	371
55	373
56	383
57	397