A285577 - cp's OEIS frontend

A285577 Irregular triangle T(n,m) read by rows (n >= 1, 0 <= m <= Max(A001221([1..n]))), giving the number of integers in [1,n] with m distinct prime factors.

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

[1, 1, 1, 1, 2, 1, 3, 1, 4, 1, 4, 1, 1, 5, 1, 1, 6, 1, 1, 7, 1, 1, 7, 2, 1, 8, 2, 1, 8, 3, 1, 9, 3, 1, 9, 4, 1, 9, 5, 1, 10, 5, 1, 11, 5, 1, 11, 6, 1, 12, 6, 1, 12, 7, 1, 12, 8, 1, 12, 9, 1, 13, 9, 1, 13, 10, 1, 14, 10, 1, 14, 11, 1, 15, 11, 1, 15, 12, 1, 16, 12]

cp's OEIS Frontend

A285577 Irregular triangle T(n,m) read by rows (n >= 1, 0 <= m <= Max(A001221([1..n]))), giving the number of integers in [1,n] with m distinct prime factors.

Table of values

List of values

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

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

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