A336939 - cp's OEIS frontend

A336939 Irregular triangle read by rows where T(n,k) is the number of divisors d of n! with k prime factors (counting multiplicity), such that both d and n!/d have distinct prime multiplicities.

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

[1, 1, 1, 1, 0, 2, 0, 1, 2, 0, 2, 1, 0, 2, 0, 0, 2, 0, 1, 2, 1, 2, 2, 1, 2, 1, 0, 2, 0, 2, 0, 2, 0, 2, 0, 0, 2, 0, 4, 2, 2, 2, 2, 4, 0, 2, 0, 0, 2, 0, 4, 0, 4, 4, 4, 4, 0, 4, 0, 2, 0, 1, 3, 2, 6, 4, 5, 7, 6, 6, 7, 5, 4, 6, 2, 3, 1, 0, 2, 0, 4, 2, 2, 4, 4, 4, 4, 4, 2, 2, 4, 0, 2, 0]

cp's OEIS Frontend

A336939 Irregular triangle read by rows where T(n,k) is the number of divisors d of n! with k prime factors (counting multiplicity), such that both d and n!/d have distinct prime multiplicities.

Table of values

List of values

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

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

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