A252021 - cp's OEIS frontend

A252021 Primes p such that (p - 1)/tau(p - 1) is also prime.

n	a(n)
1	13
2	19
3	41
4	61
5	89
6	137
7	157
8	229
9	233
10	277
11	349
12	373
13	569
14	709
15	733
16	809
17	853
18	857
19	877
20	997
21	1049
22	1069
23	1097
24	1193
25	1213
26	1237
27	1433
28	1669
29	1789
30	1913
31	2153
32	2293
33	2389
34	2677
35	2749
36	2777
37	2797
38	3209
39	3229
40	3253
41	3373
42	3449
43	3517
44	3593
45	3733
46	3833
47	3929
48	4073
49	4457
50	4549
51	4597
52	4793
53	4813
54	4909
55	4937
56	5197
57	5273

[13, 19, 41, 61, 89, 137, 157, 229, 233, 277, 349, 373, 569, 709, 733, 809, 853, 857, 877, 997, 1049, 1069, 1097, 1193, 1213, 1237, 1433, 1669, 1789, 1913, 2153, 2293, 2389, 2677, 2749, 2777, 2797, 3209, 3229, 3253, 3373, 3449, 3517, 3593, 3733, 3833, 3929, 4073, 4457, 4549, 4597, 4793, 4813, 4909, 4937, 5197, 5273]

cp's OEIS Frontend

A252021 Primes p such that (p - 1)/tau(p - 1) is also prime.

Table of values

List of values