A069832 - cp's OEIS frontend

A069832 Prefixing, suffixing or inserting a 7 in the number anywhere gives a prime.

n	a(n)
1	1
2	3
3	9
4	19
5	27
6	33
7	39
8	57
9	87
10	97
11	159
12	177
13	187
14	433
15	487
16	541
17	603
18	691
19	717
20	753
21	757
22	853
23	949
24	1257
25	1471
26	1707
27	2277
28	2367
29	2617
30	2953
31	4317
32	4507
33	4623
34	4779
35	4797
36	5773
37	6481
38	6757
39	6777
40	7017
41	7351
42	7417
43	7471
44	7479
45	7747
46	7797
47	7813
48	7977

[1, 3, 9, 19, 27, 33, 39, 57, 87, 97, 159, 177, 187, 433, 487, 541, 603, 691, 717, 753, 757, 853, 949, 1257, 1471, 1707, 2277, 2367, 2617, 2953, 4317, 4507, 4623, 4779, 4797, 5773, 6481, 6757, 6777, 7017, 7351, 7417, 7471, 7479, 7747, 7797, 7813, 7977]

cp's OEIS Frontend

A069832 Prefixing, suffixing or inserting a 7 in the number anywhere gives a prime.

Table of values

List of values