A368648 - cp's OEIS frontend

A368648 Lexicographically earliest increasing sequence of semiprimes such that a(n) + a(n+1) is a semiprime, with a(0) = 4.

n	a(n)
0	4
1	6
2	9
3	25
4	26
5	39
6	46
7	49
8	57
9	58
10	65
11	69
12	74
13	85
14	93
15	94
16	111
17	115
18	122
19	143
20	146
21	155
22	159
23	187
24	194
25	201
26	202
27	205
28	206
29	209
30	213
31	214
32	237
33	265
34	278
35	287
36	299
37	323
38	326
39	329
40	358
41	365
42	381
43	382
44	403
45	415
46	427
47	451
48	454
49	469
50	482
51	497
52	501
53	502
54	505
55	537
56	542
57	559
58	562
59	573
60	581
61	586
62	591
63	611

[4, 6, 9, 25, 26, 39, 46, 49, 57, 58, 65, 69, 74, 85, 93, 94, 111, 115, 122, 143, 146, 155, 159, 187, 194, 201, 202, 205, 206, 209, 213, 214, 237, 265, 278, 287, 299, 323, 326, 329, 358, 365, 381, 382, 403, 415, 427, 451, 454, 469, 482, 497, 501, 502, 505, 537, 542, 559, 562, 573, 581, 586, 591, 611]

cp's OEIS Frontend

A368648 Lexicographically earliest increasing sequence of semiprimes such that a(n) + a(n+1) is a semiprime, with a(0) = 4.

Table of values

List of values

n	a(n)
0	4
1	6
2	9
3	25
4	26
5	39
6	46
7	49
8	57
9	58
10	65
11	69
12	74
13	85
14	93
15	94
16	111
17	115
18	122
19	143
20	146
21	155
22	159
23	187
24	194
25	201
26	202
27	205
28	206
29	209
30	213
31	214
32	237
33	265
34	278
35	287
36	299
37	323
38	326
39	329
40	358
41	365
42	381
43	382
44	403
45	415
46	427
47	451
48	454
49	469
50	482
51	497
52	501
53	502
54	505
55	537
56	542
57	559
58	562
59	573
60	581
61	586
62	591
63	611

n	a(n)
0	4
1	6
2	9
3	25
4	26
5	39
6	46
7	49
8	57
9	58
10	65
11	69
12	74
13	85
14	93
15	94
16	111
17	115
18	122
19	143
20	146
21	155
22	159
23	187
24	194
25	201
26	202
27	205
28	206
29	209
30	213
31	214
32	237
33	265
34	278
35	287
36	299
37	323
38	326
39	329
40	358
41	365
42	381
43	382
44	403
45	415
46	427
47	451
48	454
49	469
50	482
51	497
52	501
53	502
54	505
55	537
56	542
57	559
58	562
59	573
60	581
61	586
62	591
63	611

n	a(n)
0	4
1	6
2	9
3	25
4	26
5	39
6	46
7	49
8	57
9	58
10	65
11	69
12	74
13	85
14	93
15	94
16	111
17	115
18	122
19	143
20	146
21	155
22	159
23	187
24	194
25	201
26	202
27	205
28	206
29	209
30	213
31	214
32	237
33	265
34	278
35	287
36	299
37	323
38	326
39	329
40	358
41	365
42	381
43	382
44	403
45	415
46	427
47	451
48	454
49	469
50	482
51	497
52	501
53	502
54	505
55	537
56	542
57	559
58	562
59	573
60	581
61	586
62	591
63	611