A087264 - cp's OEIS frontend

A087264 a(n) is the least initial value of a 3x+1 trajectory in which 4n is the largest(peak) term or a(n)=0 if 4n cannot be a peak.

n	a(n)
1	4
2	8
3	0
4	3
5	20
6	24
7	0
8	32
9	0
10	13
11	0
12	48
13	7
14	56
15	0
16	21
17	68
18	72
19	0
20	80
21	84
22	19
23	0
24	96
25	33
26	104
27	0
28	37
29	116
30	0
31	0
32	128
33	132
34	45
35	0
36	144
37	49
38	152
39	0
40	15
41	0
42	168
43	0
44	176
45	180
46	61
47	0
48	192
49	43
50	200
51	0
52	69
53	212
54	0
55	0
56	224
57	228
58	51
59	0
60	240
61	81
62	0
63	0
64	85
65	260
66	264
67	0
68	272
69	276
70	93
71	0
72	288

[4, 8, 0, 3, 20, 24, 0, 32, 0, 13, 0, 48, 7, 56, 0, 21, 68, 72, 0, 80, 84, 19, 0, 96, 33, 104, 0, 37, 116, 0, 0, 128, 132, 45, 0, 144, 49, 152, 0, 15, 0, 168, 0, 176, 180, 61, 0, 192, 43, 200, 0, 69, 212, 0, 0, 224, 228, 51, 0, 240, 81, 0, 0, 85, 260, 264, 0, 272, 276, 93, 0, 288]

cp's OEIS Frontend

A087264 a(n) is the least initial value of a 3x+1 trajectory in which 4n is the largest(peak) term or a(n)=0 if 4n cannot be a peak.

Table of values

List of values

n	a(n)
1	4
2	8
3	0
4	3
5	20
6	24
7	0
8	32
9	0
10	13
11	0
12	48
13	7
14	56
15	0
16	21
17	68
18	72
19	0
20	80
21	84
22	19
23	0
24	96
25	33
26	104
27	0
28	37
29	116
30	0
31	0
32	128
33	132
34	45
35	0
36	144
37	49
38	152
39	0
40	15
41	0
42	168
43	0
44	176
45	180
46	61
47	0
48	192
49	43
50	200
51	0
52	69
53	212
54	0
55	0
56	224
57	228
58	51
59	0
60	240
61	81
62	0
63	0
64	85
65	260
66	264
67	0
68	272
69	276
70	93
71	0
72	288

n	a(n)
1	4
2	8
3	0
4	3
5	20
6	24
7	0
8	32
9	0
10	13
11	0
12	48
13	7
14	56
15	0
16	21
17	68
18	72
19	0
20	80
21	84
22	19
23	0
24	96
25	33
26	104
27	0
28	37
29	116
30	0
31	0
32	128
33	132
34	45
35	0
36	144
37	49
38	152
39	0
40	15
41	0
42	168
43	0
44	176
45	180
46	61
47	0
48	192
49	43
50	200
51	0
52	69
53	212
54	0
55	0
56	224
57	228
58	51
59	0
60	240
61	81
62	0
63	0
64	85
65	260
66	264
67	0
68	272
69	276
70	93
71	0
72	288

n	a(n)
1	4
2	8
3	0
4	3
5	20
6	24
7	0
8	32
9	0
10	13
11	0
12	48
13	7
14	56
15	0
16	21
17	68
18	72
19	0
20	80
21	84
22	19
23	0
24	96
25	33
26	104
27	0
28	37
29	116
30	0
31	0
32	128
33	132
34	45
35	0
36	144
37	49
38	152
39	0
40	15
41	0
42	168
43	0
44	176
45	180
46	61
47	0
48	192
49	43
50	200
51	0
52	69
53	212
54	0
55	0
56	224
57	228
58	51
59	0
60	240
61	81
62	0
63	0
64	85
65	260
66	264
67	0
68	272
69	276
70	93
71	0
72	288