A069689 - cp's OEIS frontend

A069689 Primes that yield another prime on placing a 7 on both sides (as leading and trailing digits).

n	a(n)
1	2
2	5
3	17
4	23
5	29
6	41
7	47
8	53
9	71
10	131
11	191
12	227
13	233
14	257
15	281
16	293
17	347
18	359
19	389
20	401
21	419
22	431
23	479
24	503
25	521
26	557
27	593
28	599
29	653
30	659
31	677
32	683
33	701
34	761
35	797
36	827
37	857
38	887
39	953
40	977
41	1091
42	1097
43	1109
44	1151
45	1181
46	1187
47	1193
48	1223
49	1283
50	1307
51	1373

[2, 5, 17, 23, 29, 41, 47, 53, 71, 131, 191, 227, 233, 257, 281, 293, 347, 359, 389, 401, 419, 431, 479, 503, 521, 557, 593, 599, 653, 659, 677, 683, 701, 761, 797, 827, 857, 887, 953, 977, 1091, 1097, 1109, 1151, 1181, 1187, 1193, 1223, 1283, 1307, 1373]

cp's OEIS Frontend

A069689 Primes that yield another prime on placing a 7 on both sides (as leading and trailing digits).

Table of values

List of values