A326584 - cp's OEIS frontend

A326584 a(n) = gcd(n*N(n-1), D(n-1)), with N(n)/D(n) = B(n) the n-th Bernoulli number.

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

[1, 2, 3, 1, 5, 1, 7, 1, 3, 1, 11, 1, 13, 1, 3, 1, 17, 1, 19, 1, 3, 1, 23, 1, 5, 1, 3, 1, 29, 1, 31, 1, 3, 1, 1, 1, 37, 1, 3, 1, 41, 1, 43, 1, 15, 1, 47, 1, 7, 1, 3, 1, 53, 1, 1, 1, 3, 1, 59, 1, 61, 1, 3, 1, 5, 1, 67, 1, 3, 1, 71, 1, 73, 1, 3, 1, 1, 1, 79, 1]

cp's OEIS Frontend

A326584 a(n) = gcd(n*N(n-1), D(n-1)), with N(n)/D(n) = B(n) the n-th Bernoulli number.

Table of values

List of values

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

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

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