A197871 - cp's OEIS frontend

A197871 Irregular triangle T(n,k) of the number of numbers with k prime factors (repetitions allowed) less than n^2.

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

[0, 2, 1, 4, 3, 1, 6, 6, 2, 1, 9, 9, 4, 2, 11, 13, 7, 3, 1, 15, 17, 10, 4, 2, 18, 22, 13, 7, 2, 1, 22, 26, 19, 8, 4, 1, 25, 34, 22, 12, 4, 2, 30, 40, 28, 13, 7, 2, 34, 48, 32, 18, 7, 3, 1, 39, 56, 38, 21, 9, 4, 1, 44, 62, 48, 24, 11, 4, 2, 48, 75, 51, 29, 13, 6, 2]

cp's OEIS Frontend

A197871 Irregular triangle T(n,k) of the number of numbers with k prime factors (repetitions allowed) less than n^2.

Table of values

List of values

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

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

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