A090264 - cp's OEIS frontend

A090264 Numbers n such that the strings n7n and 7n7 are both prime.

n	a(n)
1	131
2	153
3	191
4	233
5	261
6	327
7	341
8	359
9	389
10	407
11	429
12	459
13	489
14	527
15	533
16	579
17	593
18	599
19	671
20	683
21	701
22	723
23	731
24	797
25	813
26	869
27	873
28	939
29	981
30	1083
31	1097
32	1109
33	1143
34	1187
35	1241
36	1283
37	1317
38	1391
39	1437
40	1451
41	1539
42	1553
43	1871
44	1889
45	1893
46	2049
47	2111

[131, 153, 191, 233, 261, 327, 341, 359, 389, 407, 429, 459, 489, 527, 533, 579, 593, 599, 671, 683, 701, 723, 731, 797, 813, 869, 873, 939, 981, 1083, 1097, 1109, 1143, 1187, 1241, 1283, 1317, 1391, 1437, 1451, 1539, 1553, 1871, 1889, 1893, 2049, 2111]

cp's OEIS Frontend

A090264 Numbers n such that the strings n7n and 7n7 are both prime.

Table of values

List of values