A249809 - cp's OEIS frontend

A249809 Irregular table read by rows: T(n, k) is the number of times prime p_k has occurred as the smallest prime factor of numbers 1 .. n. (T(1,1) = 0, and for each n > 1, k = 1 .. A000720(n)).

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	1
9	1
10	3
11	1
12	1
13	3
14	1
15	1
16	1
17	4
18	1
19	1
20	1
21	4
22	2
23	1
24	1
25	5
26	2
27	1
28	1
29	5
30	2
31	1
32	1
33	1
34	6
35	2
36	1
37	1
38	1
39	6
40	2
41	1
42	1
43	1
44	1
45	7
46	2
47	1
48	1
49	1
50	1
51	7
52	3
53	1
54	1
55	1
56	1
57	8
58	3
59	1
60	1
61	1
62	1
63	8
64	3
65	1
66	1
67	1
68	1
69	1
70	9
71	3
72	1
73	1
74	1
75	1
76	1
77	9
78	3
79	1
80	1
81	1
82	1
83	1
84	1
85	10
86	3
87	1
88	1
89	1
90	1
91	1
92	1
93	10
94	4
95	1
96	1
97	1
98	1
99	1
100	1
101	11
102	4
103	1
104	1
105	1
106	1
107	1
108	1
109	11
110	4
111	1
112	1
113	1
114	1
115	1
116	1
117	1

[0, 1, 1, 1, 2, 1, 2, 1, 1, 3, 1, 1, 3, 1, 1, 1, 4, 1, 1, 1, 4, 2, 1, 1, 5, 2, 1, 1, 5, 2, 1, 1, 1, 6, 2, 1, 1, 1, 6, 2, 1, 1, 1, 1, 7, 2, 1, 1, 1, 1, 7, 3, 1, 1, 1, 1, 8, 3, 1, 1, 1, 1, 8, 3, 1, 1, 1, 1, 1, 9, 3, 1, 1, 1, 1, 1, 9, 3, 1, 1, 1, 1, 1, 1, 10, 3, 1, 1, 1, 1, 1, 1, 10, 4, 1, 1, 1, 1, 1, 1, 11, 4, 1, 1, 1, 1, 1, 1, 11, 4, 1, 1, 1, 1, 1, 1, 1]

cp's OEIS Frontend

A249809 Irregular table read by rows: T(n, k) is the number of times prime p_k has occurred as the smallest prime factor of numbers 1 .. n. (T(1,1) = 0, and for each n > 1, k = 1 .. A000720(n)).

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	1
9	1
10	3
11	1
12	1
13	3
14	1
15	1
16	1
17	4
18	1
19	1
20	1
21	4
22	2
23	1
24	1
25	5
26	2
27	1
28	1
29	5
30	2
31	1
32	1
33	1
34	6
35	2
36	1
37	1
38	1
39	6
40	2
41	1
42	1
43	1
44	1
45	7
46	2
47	1
48	1
49	1
50	1
51	7
52	3
53	1
54	1
55	1
56	1
57	8
58	3
59	1
60	1
61	1
62	1
63	8
64	3
65	1
66	1
67	1
68	1
69	1
70	9
71	3
72	1
73	1
74	1
75	1
76	1
77	9
78	3
79	1
80	1
81	1
82	1
83	1
84	1
85	10
86	3
87	1
88	1
89	1
90	1
91	1
92	1
93	10
94	4
95	1
96	1
97	1
98	1
99	1
100	1
101	11
102	4
103	1
104	1
105	1
106	1
107	1
108	1
109	11
110	4
111	1
112	1
113	1
114	1
115	1
116	1
117	1

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	1
9	1
10	3
11	1
12	1
13	3
14	1
15	1
16	1
17	4
18	1
19	1
20	1
21	4
22	2
23	1
24	1
25	5
26	2
27	1
28	1
29	5
30	2
31	1
32	1
33	1
34	6
35	2
36	1
37	1
38	1
39	6
40	2
41	1
42	1
43	1
44	1
45	7
46	2
47	1
48	1
49	1
50	1
51	7
52	3
53	1
54	1
55	1
56	1
57	8
58	3
59	1
60	1
61	1
62	1
63	8
64	3
65	1
66	1
67	1
68	1
69	1
70	9
71	3
72	1
73	1
74	1
75	1
76	1
77	9
78	3
79	1
80	1
81	1
82	1
83	1
84	1
85	10
86	3
87	1
88	1
89	1
90	1
91	1
92	1
93	10
94	4
95	1
96	1
97	1
98	1
99	1
100	1
101	11
102	4
103	1
104	1
105	1
106	1
107	1
108	1
109	11
110	4
111	1
112	1
113	1
114	1
115	1
116	1
117	1

n	a(n)
1	0
2	1
3	1
4	1
5	2
6	1
7	2
8	1
9	1
10	3
11	1
12	1
13	3
14	1
15	1
16	1
17	4
18	1
19	1
20	1
21	4
22	2
23	1
24	1
25	5
26	2
27	1
28	1
29	5
30	2
31	1
32	1
33	1
34	6
35	2
36	1
37	1
38	1
39	6
40	2
41	1
42	1
43	1
44	1
45	7
46	2
47	1
48	1
49	1
50	1
51	7
52	3
53	1
54	1
55	1
56	1
57	8
58	3
59	1
60	1
61	1
62	1
63	8
64	3
65	1
66	1
67	1
68	1
69	1
70	9
71	3
72	1
73	1
74	1
75	1
76	1
77	9
78	3
79	1
80	1
81	1
82	1
83	1
84	1
85	10
86	3
87	1
88	1
89	1
90	1
91	1
92	1
93	10
94	4
95	1
96	1
97	1
98	1
99	1
100	1
101	11
102	4
103	1
104	1
105	1
106	1
107	1
108	1
109	11
110	4
111	1
112	1
113	1
114	1
115	1
116	1
117	1