A158232 - cp's OEIS frontend

A158232 Numbers which yield primes when "13" is prefixed or appended: N natural number is a member of the sequence, if P="13N" (prefixed 13) and A="N13" (appended 13) are prime.

n	a(n)
1	1
2	19
3	21
4	27
5	61
6	103
7	121
8	127
9	147
10	159
11	177
12	183
13	187
14	217
15	241
16	259
17	267
18	327
19	331
20	337
21	367
22	381
23	411
24	477
25	523
26	553
27	567
28	577
29	591
30	633
31	681
32	687
33	693
34	709
35	723
36	759
37	807
38	829
39	873
40	903
41	931
42	997
43	1009
44	1011
45	1041
46	1059
47	1129
48	1149
49	1213
50	1231
51	1251

[1, 19, 21, 27, 61, 103, 121, 127, 147, 159, 177, 183, 187, 217, 241, 259, 267, 327, 331, 337, 367, 381, 411, 477, 523, 553, 567, 577, 591, 633, 681, 687, 693, 709, 723, 759, 807, 829, 873, 903, 931, 997, 1009, 1011, 1041, 1059, 1129, 1149, 1213, 1231, 1251]

cp's OEIS Frontend

A158232 Numbers which yield primes when "13" is prefixed or appended: N natural number is a member of the sequence, if P="13N" (prefixed 13) and A="N13" (appended 13) are prime.

Table of values

List of values