A280170 - cp's OEIS frontend

A280170 Primes p such that both 2^(p-1) - 1 and 2^(p+1) - 1 are not squarefree.

n	a(n)
1	19
2	41
3	79
4	101
5	109
6	137
7	139
8	199
9	271
10	281
11	311
12	379
13	401
14	439
15	461
16	499
17	521
18	601
19	619
20	641
21	701
22	727
23	739
24	761
25	769
26	811
27	821
28	859
29	881
30	919
31	941
32	953
33	1013
34	1039
35	1061
36	1087
37	1181
38	1279
39	1301
40	1361
41	1399
42	1429
43	1459
44	1481
45	1549
46	1579
47	1601
48	1699
49	1721
50	1759
51	1777
52	1871
53	1879
54	1901

[19, 41, 79, 101, 109, 137, 139, 199, 271, 281, 311, 379, 401, 439, 461, 499, 521, 601, 619, 641, 701, 727, 739, 761, 769, 811, 821, 859, 881, 919, 941, 953, 1013, 1039, 1061, 1087, 1181, 1279, 1301, 1361, 1399, 1429, 1459, 1481, 1549, 1579, 1601, 1699, 1721, 1759, 1777, 1871, 1879, 1901]

cp's OEIS Frontend

A280170 Primes p such that both 2^(p-1) - 1 and 2^(p+1) - 1 are not squarefree.

Table of values

List of values