A255923 - cp's OEIS frontend

A255923 Bases b for which exactly two Wieferich primes p with p < b exist such that p is a base-b Wieferich prime.

n	a(n)
1	17
2	18
3	26
4	37
5	40
6	41
7	49
8	51
9	57
10	62
11	63
12	65
13	67
14	69
15	71
16	73
17	75
18	76
19	81
20	82
21	93
22	97
23	101
24	109
25	121
26	124
27	125
28	127
29	130
30	134
31	149
32	157
33	164
34	165
35	168
36	172
37	174
38	179
39	188
40	190
41	193
42	195
43	199
44	201
45	202
46	206
47	207
48	214
49	217
50	218
51	221
52	229
53	235
54	236
55	239
56	241

[17, 18, 26, 37, 40, 41, 49, 51, 57, 62, 63, 65, 67, 69, 71, 73, 75, 76, 81, 82, 93, 97, 101, 109, 121, 124, 125, 127, 130, 134, 149, 157, 164, 165, 168, 172, 174, 179, 188, 190, 193, 195, 199, 201, 202, 206, 207, 214, 217, 218, 221, 229, 235, 236, 239, 241]

cp's OEIS Frontend

A255923 Bases b for which exactly two Wieferich primes p with p < b exist such that p is a base-b Wieferich prime.

Table of values

List of values

n	a(n)
1	17
2	18
3	26
4	37
5	40
6	41
7	49
8	51
9	57
10	62
11	63
12	65
13	67
14	69
15	71
16	73
17	75
18	76
19	81
20	82
21	93
22	97
23	101
24	109
25	121
26	124
27	125
28	127
29	130
30	134
31	149
32	157
33	164
34	165
35	168
36	172
37	174
38	179
39	188
40	190
41	193
42	195
43	199
44	201
45	202
46	206
47	207
48	214
49	217
50	218
51	221
52	229
53	235
54	236
55	239
56	241

n	a(n)
1	17
2	18
3	26
4	37
5	40
6	41
7	49
8	51
9	57
10	62
11	63
12	65
13	67
14	69
15	71
16	73
17	75
18	76
19	81
20	82
21	93
22	97
23	101
24	109
25	121
26	124
27	125
28	127
29	130
30	134
31	149
32	157
33	164
34	165
35	168
36	172
37	174
38	179
39	188
40	190
41	193
42	195
43	199
44	201
45	202
46	206
47	207
48	214
49	217
50	218
51	221
52	229
53	235
54	236
55	239
56	241

n	a(n)
1	17
2	18
3	26
4	37
5	40
6	41
7	49
8	51
9	57
10	62
11	63
12	65
13	67
14	69
15	71
16	73
17	75
18	76
19	81
20	82
21	93
22	97
23	101
24	109
25	121
26	124
27	125
28	127
29	130
30	134
31	149
32	157
33	164
34	165
35	168
36	172
37	174
38	179
39	188
40	190
41	193
42	195
43	199
44	201
45	202
46	206
47	207
48	214
49	217
50	218
51	221
52	229
53	235
54	236
55	239
56	241