A110493 - cp's OEIS frontend

A110493 Largest prime p such that p^2 divides binomial(2n,n), or 0 if binomial(2n,n) is squarefree.

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

[0, 0, 0, 2, 0, 3, 2, 2, 3, 2, 2, 2, 2, 5, 5, 3, 3, 3, 5, 5, 3, 2, 2, 5, 5, 7, 7, 7, 2, 2, 2, 2, 7, 7, 7, 3, 2, 2, 5, 7, 7, 7, 3, 5, 5, 3, 7, 7, 7, 5, 3, 3, 3, 3, 2, 2, 3, 2, 2, 3, 3, 11, 11, 11, 11, 11, 5, 5, 5, 5, 5, 5, 11, 11, 11, 11, 11, 3, 5, 5, 3, 7, 7, 11, 11, 13, 13, 13, 13, 13, 13, 5, 5, 5, 11, 11]

cp's OEIS Frontend

A110493 Largest prime p such that p^2 divides binomial(2n,n), or 0 if binomial(2n,n) is squarefree.

Table of values

List of values

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

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

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