A227129 - cp's OEIS frontend

A227129 Semiprimes n = p*q, p such that both numbers n + p - 1 and n + q - 1 are prime.

n	a(n)
1	15
2	51
3	85
4	91
5	133
6	145
7	235
8	249
9	265
10	427
11	451
12	493
13	519
14	559
15	565
16	589
17	591
18	681
19	721
20	871
21	879
22	1003
23	1149
24	1177
25	1189
26	1207
27	1411
28	1441
29	1509
30	1561
31	1603
32	1651
33	1837
34	1945
35	2059
36	2071
37	2119
38	2227
39	2335
40	2391
41	2419
42	2599
43	2661
44	2827
45	2869
46	2965
47	2995

[15, 51, 85, 91, 133, 145, 235, 249, 265, 427, 451, 493, 519, 559, 565, 589, 591, 681, 721, 871, 879, 1003, 1149, 1177, 1189, 1207, 1411, 1441, 1509, 1561, 1603, 1651, 1837, 1945, 2059, 2071, 2119, 2227, 2335, 2391, 2419, 2599, 2661, 2827, 2869, 2965, 2995]

cp's OEIS Frontend

A227129 Semiprimes n = p*q, p such that both numbers n + p - 1 and n + q - 1 are prime.

Table of values

List of values