A242356 - cp's OEIS frontend

A242356 Triangular numbers T such that both (T+2) and (T-2) are semiprimes.

n	a(n)
1	36
2	120
3	276
4	300
5	325
6	903
7	1653
8	2485
9	2556
10	3240
11	4851
12	5253
13	5460
14	5995
15	6105
16	6441
17	6903
18	8001
19	8256
20	8911
21	9591
22	10585
23	12561
24	12720
25	14365
26	20301
27	21115
28	22791
29	23436
30	24753
31	26335
32	26565
33	26796
34	27495
35	29161
36	30381
37	31375
38	34191
39	34980
40	37401
41	40755

[36, 120, 276, 300, 325, 903, 1653, 2485, 2556, 3240, 4851, 5253, 5460, 5995, 6105, 6441, 6903, 8001, 8256, 8911, 9591, 10585, 12561, 12720, 14365, 20301, 21115, 22791, 23436, 24753, 26335, 26565, 26796, 27495, 29161, 30381, 31375, 34191, 34980, 37401, 40755]

cp's OEIS Frontend

A242356 Triangular numbers T such that both (T+2) and (T-2) are semiprimes.

Table of values

List of values