A188059 - cp's OEIS frontend

A188059 Numbers k with the property that k, k+1 and 2*k+1 are all semiprimes.

n	a(n)
1	25
2	34
3	38
4	57
5	93
6	118
7	133
8	145
9	177
10	201
11	205
12	213
13	218
14	298
15	334
16	361
17	381
18	394
19	446
20	501
21	633
22	694
23	698
24	842
25	865
26	878
27	898
28	921
29	1114
30	1141
31	1226
32	1285
33	1293
34	1465
35	1513
36	1654
37	1713
38	1726
39	1761
40	1857
41	1893
42	1941
43	1981
44	2018
45	2041
46	2217
47	2306
48	2426
49	2433
50	2577
51	2581
52	2734
53	2746
54	2901
55	2973
56	3133
57	3193
58	3214
59	3241
60	3386
61	3578
62	3661
63	3693
64	3746
65	3754
66	3777
67	3826
68	3957

[25, 34, 38, 57, 93, 118, 133, 145, 177, 201, 205, 213, 218, 298, 334, 361, 381, 394, 446, 501, 633, 694, 698, 842, 865, 878, 898, 921, 1114, 1141, 1226, 1285, 1293, 1465, 1513, 1654, 1713, 1726, 1761, 1857, 1893, 1941, 1981, 2018, 2041, 2217, 2306, 2426, 2433, 2577, 2581, 2734, 2746, 2901, 2973, 3133, 3193, 3214, 3241, 3386, 3578, 3661, 3693, 3746, 3754, 3777, 3826, 3957]

cp's OEIS Frontend

A188059 Numbers k with the property that k, k+1 and 2*k+1 are all semiprimes.

Table of values

List of values