A133123 - cp's OEIS frontend

A133123 Double Sophie Germain semiprimes: semiprimes s such that s1=2s+1 and s2=2s1+1 are also semiprimes.

n	a(n)
1	38
2	46
3	106
4	129
5	133
6	145
7	169
8	201
9	203
10	235
11	289
12	291
13	298
14	334
15	335
16	381
17	407
18	417
19	458
20	489
21	497
22	529
23	538
24	579
25	583
26	597
27	623
28	626
29	649
30	685
31	689
32	694
33	707
34	758
35	767
36	781
37	815
38	898
39	899
40	921
41	926
42	959
43	995
44	1073
45	1079
46	1082
47	1094
48	1099
49	1139
50	1142

[38, 46, 106, 129, 133, 145, 169, 201, 203, 235, 289, 291, 298, 334, 335, 381, 407, 417, 458, 489, 497, 529, 538, 579, 583, 597, 623, 626, 649, 685, 689, 694, 707, 758, 767, 781, 815, 898, 899, 921, 926, 959, 995, 1073, 1079, 1082, 1094, 1099, 1139, 1142]

cp's OEIS Frontend

A133123 Double Sophie Germain semiprimes: semiprimes s such that s1=2s+1 and s2=2s1+1 are also semiprimes.

Table of values

List of values