A086256 - cp's OEIS frontend

A086256 Number of base-2 Fermat pseudoprimes that divide 2^n-1.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	0
13	0
14	1
15	1
16	1
17	0
18	1
19	0
20	2
21	1
22	4
23	1
24	2
25	1
26	1
27	0
28	13
29	4
30	5
31	0
32	2
33	2
34	1
35	1
36	13
37	1
38	1
39	4
40	7
41	1
42	11
43	4
44	14
45	9
46	4
47	4
48	28
49	0
50	12
51	11
52	12
53	4
54	2
55	5
56	28
57	4
58	26
59	1
60	63
61	0
62	1
63	5
64	12
65	1
66	29
67	1
68	12
69	2
70	44
71	4
72	101
73	4
74	11
75	27
76	12
77	1
78	26
79	4
80	15
81	4
82	11
83	1
84	75
85	1
86	11
87	14
88	36
89	0
90	40
91	11

[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 2, 1, 4, 1, 2, 1, 1, 0, 13, 4, 5, 0, 2, 2, 1, 1, 13, 1, 1, 4, 7, 1, 11, 4, 14, 9, 4, 4, 28, 0, 12, 11, 12, 4, 2, 5, 28, 4, 26, 1, 63, 0, 1, 5, 12, 1, 29, 1, 12, 2, 44, 4, 101, 4, 11, 27, 12, 1, 26, 4, 15, 4, 11, 1, 75, 1, 11, 14, 36, 0, 40, 11]

cp's OEIS Frontend

A086256 Number of base-2 Fermat pseudoprimes that divide 2^n-1.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	0
13	0
14	1
15	1
16	1
17	0
18	1
19	0
20	2
21	1
22	4
23	1
24	2
25	1
26	1
27	0
28	13
29	4
30	5
31	0
32	2
33	2
34	1
35	1
36	13
37	1
38	1
39	4
40	7
41	1
42	11
43	4
44	14
45	9
46	4
47	4
48	28
49	0
50	12
51	11
52	12
53	4
54	2
55	5
56	28
57	4
58	26
59	1
60	63
61	0
62	1
63	5
64	12
65	1
66	29
67	1
68	12
69	2
70	44
71	4
72	101
73	4
74	11
75	27
76	12
77	1
78	26
79	4
80	15
81	4
82	11
83	1
84	75
85	1
86	11
87	14
88	36
89	0
90	40
91	11

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	0
13	0
14	1
15	1
16	1
17	0
18	1
19	0
20	2
21	1
22	4
23	1
24	2
25	1
26	1
27	0
28	13
29	4
30	5
31	0
32	2
33	2
34	1
35	1
36	13
37	1
38	1
39	4
40	7
41	1
42	11
43	4
44	14
45	9
46	4
47	4
48	28
49	0
50	12
51	11
52	12
53	4
54	2
55	5
56	28
57	4
58	26
59	1
60	63
61	0
62	1
63	5
64	12
65	1
66	29
67	1
68	12
69	2
70	44
71	4
72	101
73	4
74	11
75	27
76	12
77	1
78	26
79	4
80	15
81	4
82	11
83	1
84	75
85	1
86	11
87	14
88	36
89	0
90	40
91	11

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	1
11	1
12	0
13	0
14	1
15	1
16	1
17	0
18	1
19	0
20	2
21	1
22	4
23	1
24	2
25	1
26	1
27	0
28	13
29	4
30	5
31	0
32	2
33	2
34	1
35	1
36	13
37	1
38	1
39	4
40	7
41	1
42	11
43	4
44	14
45	9
46	4
47	4
48	28
49	0
50	12
51	11
52	12
53	4
54	2
55	5
56	28
57	4
58	26
59	1
60	63
61	0
62	1
63	5
64	12
65	1
66	29
67	1
68	12
69	2
70	44
71	4
72	101
73	4
74	11
75	27
76	12
77	1
78	26
79	4
80	15
81	4
82	11
83	1
84	75
85	1
86	11
87	14
88	36
89	0
90	40
91	11