A210515 - cp's OEIS frontend

A210515 Numbers N such that concatenation of N, N, and x generates a prime for x=1 and x=3 and x=7 and x=9.

n	a(n)
1	1235
2	4061
3	8255
4	22775
5	24665
6	36500
7	44501
8	52343
9	54434
10	57644
11	58109
12	59567
13	59588
14	65018
15	69407
16	71789
17	78689
18	94280
19	98594
20	106748
21	114272
22	122504
23	134369
24	137129
25	138905
26	144302
27	162236
28	196439
29	235808
30	238235
31	269912
32	277919
33	278633
34	282461
35	290534

[1235, 4061, 8255, 22775, 24665, 36500, 44501, 52343, 54434, 57644, 58109, 59567, 59588, 65018, 69407, 71789, 78689, 94280, 98594, 106748, 114272, 122504, 134369, 137129, 138905, 144302, 162236, 196439, 235808, 238235, 269912, 277919, 278633, 282461, 290534]

cp's OEIS Frontend

A210515 Numbers N such that concatenation of N, N, and x generates a prime for x=1 and x=3 and x=7 and x=9.

Table of values

List of values