A205561 - cp's OEIS frontend

A205561 Least positive integer k such that n divides (2k)! - (2j)! for some j in [1,k-1].

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

[2, 2, 3, 3, 4, 3, 5, 3, 4, 4, 2, 3, 8, 5, 4, 4, 10, 4, 4, 4, 5, 2, 4, 3, 4, 8, 6, 5, 3, 4, 5, 5, 4, 10, 5, 4, 20, 4, 8, 4, 11, 5, 10, 4, 4, 4, 5, 4, 6, 4, 10, 8, 6, 6, 4, 5, 8, 3, 13, 4, 8, 5, 5, 5, 8, 4, 16, 10, 4, 5, 7, 4, 4, 20, 4, 8, 7, 8, 11, 4, 6, 11, 22, 5, 10, 10, 3, 4, 5, 4, 8, 4]

cp's OEIS Frontend

A205561 Least positive integer k such that n divides (2k)! - (2j)! for some j in [1,k-1].

Table of values

List of values

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

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

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