A116505 - cp's OEIS frontend

A116505 Number of distinct prime divisors of the concatenation of 1..n.

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

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

cp's OEIS Frontend

A116505 Number of distinct prime divisors of the concatenation of 1..n.

Table of values

List of values

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

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

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