A259788 - cp's OEIS frontend

A259788 Greatest prime factor of phi(binomial(2*n,n)).

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

[2, 2, 3, 3, 5, 5, 5, 5, 5, 3, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 7, 23, 23, 23, 23, 23, 23, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 53, 83, 83, 83, 83, 83, 83, 89]

cp's OEIS Frontend

A259788 Greatest prime factor of phi(binomial(2*n,n)).

Table of values

List of values

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

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

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