A249808 - cp's OEIS frontend

A249808 Triangular table read by rows, a lower right triangular region of square array A(n,k) is the number of times prime p_k has occurred as the smallest prime factor of numbers 1..n.

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	1
9	0
10	0
11	2
12	1
13	1
14	0
15	0
16	3
17	1
18	1
19	0
20	0
21	0
22	3
23	1
24	1
25	1
26	0
27	0
28	0
29	4
30	1
31	1
32	1
33	0
34	0
35	0
36	0
37	4
38	2
39	1
40	1
41	0
42	0
43	0
44	0
45	0
46	5
47	2
48	1
49	1
50	0
51	0
52	0
53	0
54	0
55	0
56	5
57	2
58	1
59	1
60	1
61	0
62	0
63	0
64	0
65	0
66	0
67	6
68	2
69	1
70	1
71	1
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	6
80	2
81	1
82	1
83	1
84	1
85	0
86	0
87	0
88	0
89	0
90	0
91	0
92	7
93	2
94	1
95	1
96	1
97	1
98	0
99	0
100	0
101	0
102	0
103	0
104	0
105	0
106	7
107	3
108	1
109	1
110	1
111	1
112	0
113	0
114	0
115	0
116	0
117	0
118	0
119	0
120	0

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

cp's OEIS Frontend

A249808 Triangular table read by rows, a lower right triangular region of square array A(n,k) is the number of times prime p_k has occurred as the smallest prime factor of numbers 1..n.

Table of values

List of values

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	1
9	0
10	0
11	2
12	1
13	1
14	0
15	0
16	3
17	1
18	1
19	0
20	0
21	0
22	3
23	1
24	1
25	1
26	0
27	0
28	0
29	4
30	1
31	1
32	1
33	0
34	0
35	0
36	0
37	4
38	2
39	1
40	1
41	0
42	0
43	0
44	0
45	0
46	5
47	2
48	1
49	1
50	0
51	0
52	0
53	0
54	0
55	0
56	5
57	2
58	1
59	1
60	1
61	0
62	0
63	0
64	0
65	0
66	0
67	6
68	2
69	1
70	1
71	1
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	6
80	2
81	1
82	1
83	1
84	1
85	0
86	0
87	0
88	0
89	0
90	0
91	0
92	7
93	2
94	1
95	1
96	1
97	1
98	0
99	0
100	0
101	0
102	0
103	0
104	0
105	0
106	7
107	3
108	1
109	1
110	1
111	1
112	0
113	0
114	0
115	0
116	0
117	0
118	0
119	0
120	0

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	1
9	0
10	0
11	2
12	1
13	1
14	0
15	0
16	3
17	1
18	1
19	0
20	0
21	0
22	3
23	1
24	1
25	1
26	0
27	0
28	0
29	4
30	1
31	1
32	1
33	0
34	0
35	0
36	0
37	4
38	2
39	1
40	1
41	0
42	0
43	0
44	0
45	0
46	5
47	2
48	1
49	1
50	0
51	0
52	0
53	0
54	0
55	0
56	5
57	2
58	1
59	1
60	1
61	0
62	0
63	0
64	0
65	0
66	0
67	6
68	2
69	1
70	1
71	1
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	6
80	2
81	1
82	1
83	1
84	1
85	0
86	0
87	0
88	0
89	0
90	0
91	0
92	7
93	2
94	1
95	1
96	1
97	1
98	0
99	0
100	0
101	0
102	0
103	0
104	0
105	0
106	7
107	3
108	1
109	1
110	1
111	1
112	0
113	0
114	0
115	0
116	0
117	0
118	0
119	0
120	0

n	a(n)
1	0
2	1
3	0
4	1
5	1
6	0
7	2
8	1
9	0
10	0
11	2
12	1
13	1
14	0
15	0
16	3
17	1
18	1
19	0
20	0
21	0
22	3
23	1
24	1
25	1
26	0
27	0
28	0
29	4
30	1
31	1
32	1
33	0
34	0
35	0
36	0
37	4
38	2
39	1
40	1
41	0
42	0
43	0
44	0
45	0
46	5
47	2
48	1
49	1
50	0
51	0
52	0
53	0
54	0
55	0
56	5
57	2
58	1
59	1
60	1
61	0
62	0
63	0
64	0
65	0
66	0
67	6
68	2
69	1
70	1
71	1
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	6
80	2
81	1
82	1
83	1
84	1
85	0
86	0
87	0
88	0
89	0
90	0
91	0
92	7
93	2
94	1
95	1
96	1
97	1
98	0
99	0
100	0
101	0
102	0
103	0
104	0
105	0
106	7
107	3
108	1
109	1
110	1
111	1
112	0
113	0
114	0
115	0
116	0
117	0
118	0
119	0
120	0