A346617 - cp's OEIS frontend

A346617 Irregular triangle T(n,m) read by rows (n >= 1, 1 <= m <= Max(A001221([1..n]))): T(n,m) = number of integers in [1,n] with m distinct prime factors.

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

[0, 1, 2, 3, 4, 4, 1, 5, 1, 6, 1, 7, 1, 7, 2, 8, 2, 8, 3, 9, 3, 9, 4, 9, 5, 10, 5, 11, 5, 11, 6, 12, 6, 12, 7, 12, 8, 12, 9, 13, 9, 13, 10, 14, 10, 14, 11, 15, 11, 15, 12, 16, 12, 16, 12, 1, 17, 12, 1, 18, 12, 1, 18, 13, 1, 18, 14, 1, 18, 15, 1, 18, 16, 1, 19, 16, 1, 19, 17, 1]

cp's OEIS Frontend

A346617 Irregular triangle T(n,m) read by rows (n >= 1, 1 <= m <= Max(A001221([1..n]))): T(n,m) = number of integers in [1,n] with m distinct prime factors.

Table of values

List of values

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

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

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