A091888 - cp's OEIS frontend

A091888 Irregularity index of prime(n): number of numbers k, 1 <= k <= (p-3)/2, such that p = prime(n) divides the numerator of the Bernoulli number B(2k).

n	a(n)
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	1
13	0
14	0
15	0
16	0
17	1
18	0
19	1
20	0
21	0
22	0
23	0
24	0
25	0
26	1
27	1
28	0
29	0
30	0
31	0
32	1
33	0
34	0
35	1
36	0
37	2
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	0
47	0
48	0
49	0
50	0
51	1
52	0
53	0
54	0
55	1
56	1
57	0
58	1
59	0
60	0
61	1
62	1
63	1
64	1
65	0
66	0
67	0
68	0
69	1
70	0
71	2
72	0
73	0
74	0
75	2
76	0
77	1
78	0
79	1
80	1
81	0
82	1
83	0
84	1
85	0
86	0
87	0
88	0
89	1
90	1
91	2
92	0
93	0
94	3
95	0
96	0
97	0
98	0
99	1
100	1
101	2
102	1
103	0
104	0
105	0
106	1

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 2, 0, 0, 0, 2, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 2, 0, 0, 3, 0, 0, 0, 0, 1, 1, 2, 1, 0, 0, 0, 1]

cp's OEIS Frontend

A091888 Irregularity index of prime(n): number of numbers k, 1 <= k <= (p-3)/2, such that p = prime(n) divides the numerator of the Bernoulli number B(2k).

Table of values

List of values

n	a(n)
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	1
13	0
14	0
15	0
16	0
17	1
18	0
19	1
20	0
21	0
22	0
23	0
24	0
25	0
26	1
27	1
28	0
29	0
30	0
31	0
32	1
33	0
34	0
35	1
36	0
37	2
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	0
47	0
48	0
49	0
50	0
51	1
52	0
53	0
54	0
55	1
56	1
57	0
58	1
59	0
60	0
61	1
62	1
63	1
64	1
65	0
66	0
67	0
68	0
69	1
70	0
71	2
72	0
73	0
74	0
75	2
76	0
77	1
78	0
79	1
80	1
81	0
82	1
83	0
84	1
85	0
86	0
87	0
88	0
89	1
90	1
91	2
92	0
93	0
94	3
95	0
96	0
97	0
98	0
99	1
100	1
101	2
102	1
103	0
104	0
105	0
106	1

n	a(n)
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	1
13	0
14	0
15	0
16	0
17	1
18	0
19	1
20	0
21	0
22	0
23	0
24	0
25	0
26	1
27	1
28	0
29	0
30	0
31	0
32	1
33	0
34	0
35	1
36	0
37	2
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	0
47	0
48	0
49	0
50	0
51	1
52	0
53	0
54	0
55	1
56	1
57	0
58	1
59	0
60	0
61	1
62	1
63	1
64	1
65	0
66	0
67	0
68	0
69	1
70	0
71	2
72	0
73	0
74	0
75	2
76	0
77	1
78	0
79	1
80	1
81	0
82	1
83	0
84	1
85	0
86	0
87	0
88	0
89	1
90	1
91	2
92	0
93	0
94	3
95	0
96	0
97	0
98	0
99	1
100	1
101	2
102	1
103	0
104	0
105	0
106	1

n	a(n)
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	0
11	0
12	1
13	0
14	0
15	0
16	0
17	1
18	0
19	1
20	0
21	0
22	0
23	0
24	0
25	0
26	1
27	1
28	0
29	0
30	0
31	0
32	1
33	0
34	0
35	1
36	0
37	2
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	0
47	0
48	0
49	0
50	0
51	1
52	0
53	0
54	0
55	1
56	1
57	0
58	1
59	0
60	0
61	1
62	1
63	1
64	1
65	0
66	0
67	0
68	0
69	1
70	0
71	2
72	0
73	0
74	0
75	2
76	0
77	1
78	0
79	1
80	1
81	0
82	1
83	0
84	1
85	0
86	0
87	0
88	0
89	1
90	1
91	2
92	0
93	0
94	3
95	0
96	0
97	0
98	0
99	1
100	1
101	2
102	1
103	0
104	0
105	0
106	1