A048571 - cp's OEIS frontend

A048571 Triangle read by rows: T(n,k) = number of distinct prime factors of C(n,k).

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

[0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 2, 1, 0, 0, 1, 2, 2, 1, 0, 0, 2, 2, 2, 2, 2, 0, 0, 1, 2, 2, 2, 2, 1, 0, 0, 1, 2, 2, 3, 2, 2, 1, 0, 0, 1, 2, 3, 3, 3, 3, 2, 1, 0, 0, 2, 2, 3, 4, 3, 4, 3, 2, 2, 0, 0, 1, 2, 3, 4, 4, 4, 4, 3, 2, 1, 0, 0, 2, 3, 3, 3, 3, 4, 3, 3, 3, 3, 2, 0]

cp's OEIS Frontend

A048571 Triangle read by rows: T(n,k) = number of distinct prime factors of C(n,k).

Table of values

List of values

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

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

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