A108278 - cp's OEIS frontend

A108278 Numbers k such that k^2-1 and k^2+1 are semiprimes.

n	a(n)
1	12
2	30
3	42
4	60
5	102
6	108
7	198
8	312
9	462
10	522
11	600
12	810
13	828
14	1020
15	1050
16	1062
17	1278
18	1452
19	1488
20	1872
21	1950
22	2028
23	2130
24	2142
25	2340
26	2790
27	2802
28	2970
29	3000
30	3120
31	3252
32	3300
33	3330
34	3672
35	3930
36	4020
37	4092
38	4230
39	4548
40	4800
41	5280
42	5640
43	5652
44	5658
45	6198

[12, 30, 42, 60, 102, 108, 198, 312, 462, 522, 600, 810, 828, 1020, 1050, 1062, 1278, 1452, 1488, 1872, 1950, 2028, 2130, 2142, 2340, 2790, 2802, 2970, 3000, 3120, 3252, 3300, 3330, 3672, 3930, 4020, 4092, 4230, 4548, 4800, 5280, 5640, 5652, 5658, 6198]

cp's OEIS Frontend

A108278 Numbers k such that k^2-1 and k^2+1 are semiprimes.

Table of values

List of values