A217689 - cp's OEIS frontend

A217689 a(1)=2, a(2)=3, a(3)=4; for n>=4, a(n) is the largest number <= prime(n) such that no terms of the sequence are between a(n-1)/2 and a(n)/2.

n	a(n)
1	2
2	3
3	4
4	6
5	8
6	12
7	16
8	19
9	23
10	24
11	31
12	32
13	38
14	43
15	46
16	48
17	59
18	61
19	62
20	64
21	73
22	76
23	83
24	86
25	92
26	96
27	103
28	107
29	109
30	113
31	118
32	122
33	124
34	128
35	146
36	151
37	152
38	163
39	166
40	172
41	179
42	181
43	184
44	192
45	197
46	199
47	206
48	214
49	218
50	226
51	233
52	236
53	241
54	244
55	248
56	256
57	269
58	271
59	277
60	281
61	283
62	292
63	302
64	304
65	313
66	317
67	326
68	332
69	344
70	349
71	353
72	358

[2, 3, 4, 6, 8, 12, 16, 19, 23, 24, 31, 32, 38, 43, 46, 48, 59, 61, 62, 64, 73, 76, 83, 86, 92, 96, 103, 107, 109, 113, 118, 122, 124, 128, 146, 151, 152, 163, 166, 172, 179, 181, 184, 192, 197, 199, 206, 214, 218, 226, 233, 236, 241, 244, 248, 256, 269, 271, 277, 281, 283, 292, 302, 304, 313, 317, 326, 332, 344, 349, 353, 358]

cp's OEIS Frontend

A217689 a(1)=2, a(2)=3, a(3)=4; for n>=4, a(n) is the largest number <= prime(n) such that no terms of the sequence are between a(n-1)/2 and a(n)/2.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	6
5	8
6	12
7	16
8	19
9	23
10	24
11	31
12	32
13	38
14	43
15	46
16	48
17	59
18	61
19	62
20	64
21	73
22	76
23	83
24	86
25	92
26	96
27	103
28	107
29	109
30	113
31	118
32	122
33	124
34	128
35	146
36	151
37	152
38	163
39	166
40	172
41	179
42	181
43	184
44	192
45	197
46	199
47	206
48	214
49	218
50	226
51	233
52	236
53	241
54	244
55	248
56	256
57	269
58	271
59	277
60	281
61	283
62	292
63	302
64	304
65	313
66	317
67	326
68	332
69	344
70	349
71	353
72	358

n	a(n)
1	2
2	3
3	4
4	6
5	8
6	12
7	16
8	19
9	23
10	24
11	31
12	32
13	38
14	43
15	46
16	48
17	59
18	61
19	62
20	64
21	73
22	76
23	83
24	86
25	92
26	96
27	103
28	107
29	109
30	113
31	118
32	122
33	124
34	128
35	146
36	151
37	152
38	163
39	166
40	172
41	179
42	181
43	184
44	192
45	197
46	199
47	206
48	214
49	218
50	226
51	233
52	236
53	241
54	244
55	248
56	256
57	269
58	271
59	277
60	281
61	283
62	292
63	302
64	304
65	313
66	317
67	326
68	332
69	344
70	349
71	353
72	358

n	a(n)
1	2
2	3
3	4
4	6
5	8
6	12
7	16
8	19
9	23
10	24
11	31
12	32
13	38
14	43
15	46
16	48
17	59
18	61
19	62
20	64
21	73
22	76
23	83
24	86
25	92
26	96
27	103
28	107
29	109
30	113
31	118
32	122
33	124
34	128
35	146
36	151
37	152
38	163
39	166
40	172
41	179
42	181
43	184
44	192
45	197
46	199
47	206
48	214
49	218
50	226
51	233
52	236
53	241
54	244
55	248
56	256
57	269
58	271
59	277
60	281
61	283
62	292
63	302
64	304
65	313
66	317
67	326
68	332
69	344
70	349
71	353
72	358