A259075 - cp's OEIS frontend

A259075 Smallest base b > 1 such that both prime(n) and prime(n+1) are base-b Wieferich primes, i.e., p = prime(n) satisfies b^(p-1) == 1 (mod p^2) and q = prime(n+1) satisfies b^(q-1) == 1 (mod q^2).

n	a(n)
1	17
2	26
3	18
4	148
5	239
6	249
7	423
8	28
9	63
10	374
11	117
12	787
13	2059
14	1085
15	655
16	4586
17	4153
18	3147
19	10056
20	4559
21	2092
22	18692
23	19487
24	3018
25	19343
26	14285
27	164
28	31469
29	6817
30	7916
31	16128
32	4505
33	18768
34	2752
35	26664
36	16717
37	129702
38	46171
39	1040
40	3608
41	9479
42	4840
43	42348
44	14128

[17, 26, 18, 148, 239, 249, 423, 28, 63, 374, 117, 787, 2059, 1085, 655, 4586, 4153, 3147, 10056, 4559, 2092, 18692, 19487, 3018, 19343, 14285, 164, 31469, 6817, 7916, 16128, 4505, 18768, 2752, 26664, 16717, 129702, 46171, 1040, 3608, 9479, 4840, 42348, 14128]

cp's OEIS Frontend

A259075 Smallest base b > 1 such that both prime(n) and prime(n+1) are base-b Wieferich primes, i.e., p = prime(n) satisfies b^(p-1) == 1 (mod p^2) and q = prime(n+1) satisfies b^(q-1) == 1 (mod q^2).

Table of values

List of values