A109497 - cp's OEIS frontend

A109497 Number of lucky numbers <= n.

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

[1, 1, 2, 2, 2, 2, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 17, 17, 17, 17, 18, 18, 19, 19, 19, 19, 20, 20]

cp's OEIS Frontend

A109497 Number of lucky numbers <= n.

Table of values

List of values

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

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

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