A361611 - cp's OEIS frontend

A361611 Lexicographically least increasing sequence of semiprimes a(n) such that a(n) - a(n-1) and a(n) + a(n-1) are also semiprimes.

n	a(n)
1	4
2	10
3	25
4	94
5	115
6	206
7	221
8	298
9	391
10	478
11	511
12	526
13	551
14	586
15	655
16	694
17	703
18	758
19	779
20	934
21	949
22	974
23	989
24	993
25	1126
26	1159
27	1418
28	1513
29	1522
30	1555
31	1594
32	1603
33	1658
34	1679
35	1718
36	1769
37	2018
38	2051
39	2066
40	2105
41	2174
42	2195
43	2234
44	2319
45	2462
46	2501
47	2578
48	2587
49	2846
50	2867
51	2906
52	2931
53	2986
54	3007

[4, 10, 25, 94, 115, 206, 221, 298, 391, 478, 511, 526, 551, 586, 655, 694, 703, 758, 779, 934, 949, 974, 989, 993, 1126, 1159, 1418, 1513, 1522, 1555, 1594, 1603, 1658, 1679, 1718, 1769, 2018, 2051, 2066, 2105, 2174, 2195, 2234, 2319, 2462, 2501, 2578, 2587, 2846, 2867, 2906, 2931, 2986, 3007]

cp's OEIS Frontend

A361611 Lexicographically least increasing sequence of semiprimes a(n) such that a(n) - a(n-1) and a(n) + a(n-1) are also semiprimes.

Table of values

List of values