A176550 - cp's OEIS frontend

A176550 Numbers k such that (k-th odd semiprime)/(j-th prime) is prime and ((k+1)-th odd semiprime)/((j+1)-th prime) is prime for some j.

n	a(n)
1	1
2	2
3	3
4	5
5	9
6	11
7	18
8	20
9	21
10	22
11	24
12	29
13	34
14	35
15	42
16	43
17	57
18	61
19	74
20	79
21	81
22	95
23	101
24	102
25	111
26	112
27	118
28	120
29	123
30	128
31	136
32	151
33	153
34	154
35	163
36	166
37	167
38	170
39	173
40	177
41	190
42	194
43	195
44	198
45	199
46	203
47	205
48	208
49	212
50	213
51	239
52	242
53	245
54	263
55	267
56	271
57	278
58	283

[1, 2, 3, 5, 9, 11, 18, 20, 21, 22, 24, 29, 34, 35, 42, 43, 57, 61, 74, 79, 81, 95, 101, 102, 111, 112, 118, 120, 123, 128, 136, 151, 153, 154, 163, 166, 167, 170, 173, 177, 190, 194, 195, 198, 199, 203, 205, 208, 212, 213, 239, 242, 245, 263, 267, 271, 278, 283]

cp's OEIS Frontend

A176550 Numbers k such that (k-th odd semiprime)/(j-th prime) is prime and ((k+1)-th odd semiprime)/((j+1)-th prime) is prime for some j.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	9
6	11
7	18
8	20
9	21
10	22
11	24
12	29
13	34
14	35
15	42
16	43
17	57
18	61
19	74
20	79
21	81
22	95
23	101
24	102
25	111
26	112
27	118
28	120
29	123
30	128
31	136
32	151
33	153
34	154
35	163
36	166
37	167
38	170
39	173
40	177
41	190
42	194
43	195
44	198
45	199
46	203
47	205
48	208
49	212
50	213
51	239
52	242
53	245
54	263
55	267
56	271
57	278
58	283

n	a(n)
1	1
2	2
3	3
4	5
5	9
6	11
7	18
8	20
9	21
10	22
11	24
12	29
13	34
14	35
15	42
16	43
17	57
18	61
19	74
20	79
21	81
22	95
23	101
24	102
25	111
26	112
27	118
28	120
29	123
30	128
31	136
32	151
33	153
34	154
35	163
36	166
37	167
38	170
39	173
40	177
41	190
42	194
43	195
44	198
45	199
46	203
47	205
48	208
49	212
50	213
51	239
52	242
53	245
54	263
55	267
56	271
57	278
58	283

n	a(n)
1	1
2	2
3	3
4	5
5	9
6	11
7	18
8	20
9	21
10	22
11	24
12	29
13	34
14	35
15	42
16	43
17	57
18	61
19	74
20	79
21	81
22	95
23	101
24	102
25	111
26	112
27	118
28	120
29	123
30	128
31	136
32	151
33	153
34	154
35	163
36	166
37	167
38	170
39	173
40	177
41	190
42	194
43	195
44	198
45	199
46	203
47	205
48	208
49	212
50	213
51	239
52	242
53	245
54	263
55	267
56	271
57	278
58	283