A235923 - cp's OEIS frontend

A235923 Minimal k > 1 such that the base-k representation of the n-th Ramanujan prime (A104272), read in decimal, is also a Ramanujan prime.

n	a(n)
1	3
2	10
3	4
4	7
5	10
6	2
7	10
8	6
9	5
10	6
11	5
12	10
13	7
14	10
15	8
16	10
17	2
18	10
19	10
20	2
21	10
22	7
23	4
24	10
25	10
26	8
27	3
28	4
29	10
30	3
31	3
32	3
33	10
34	10
35	4
36	10
37	3
38	10
39	10
40	6
41	7
42	10

[3, 10, 4, 7, 10, 2, 10, 6, 5, 6, 5, 10, 7, 10, 8, 10, 2, 10, 10, 2, 10, 7, 4, 10, 10, 8, 3, 4, 10, 3, 3, 3, 10, 10, 4, 10, 3, 10, 10, 6, 7, 10]