A211264 - cp's OEIS frontend

A211264 Number of integer pairs (x,y) such that 0 < x < y <= n and x*y <= n.

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	6
7	7
8	9
9	10
10	12
11	13
12	16
13	17
14	19
15	21
16	23
17	24
18	27
19	28
20	31
21	33
22	35
23	36
24	40
25	41
26	43
27	45
28	48
29	49
30	53
31	54
32	57
33	59
34	61
35	63
36	67
37	68
38	70
39	72
40	76
41	77
42	81
43	82
44	85
45	88
46	90
47	91
48	96
49	97
50	100
51	102
52	105
53	106
54	110
55	112
56	116
57	118
58	120
59	121
60	127
61	128
62	130
63	133
64	136

[0, 1, 2, 3, 4, 6, 7, 9, 10, 12, 13, 16, 17, 19, 21, 23, 24, 27, 28, 31, 33, 35, 36, 40, 41, 43, 45, 48, 49, 53, 54, 57, 59, 61, 63, 67, 68, 70, 72, 76, 77, 81, 82, 85, 88, 90, 91, 96, 97, 100, 102, 105, 106, 110, 112, 116, 118, 120, 121, 127, 128, 130, 133, 136]

cp's OEIS Frontend

A211264 Number of integer pairs (x,y) such that 0 < x < y <= n and x*y <= n.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	6
7	7
8	9
9	10
10	12
11	13
12	16
13	17
14	19
15	21
16	23
17	24
18	27
19	28
20	31
21	33
22	35
23	36
24	40
25	41
26	43
27	45
28	48
29	49
30	53
31	54
32	57
33	59
34	61
35	63
36	67
37	68
38	70
39	72
40	76
41	77
42	81
43	82
44	85
45	88
46	90
47	91
48	96
49	97
50	100
51	102
52	105
53	106
54	110
55	112
56	116
57	118
58	120
59	121
60	127
61	128
62	130
63	133
64	136

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	6
7	7
8	9
9	10
10	12
11	13
12	16
13	17
14	19
15	21
16	23
17	24
18	27
19	28
20	31
21	33
22	35
23	36
24	40
25	41
26	43
27	45
28	48
29	49
30	53
31	54
32	57
33	59
34	61
35	63
36	67
37	68
38	70
39	72
40	76
41	77
42	81
43	82
44	85
45	88
46	90
47	91
48	96
49	97
50	100
51	102
52	105
53	106
54	110
55	112
56	116
57	118
58	120
59	121
60	127
61	128
62	130
63	133
64	136

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	6
7	7
8	9
9	10
10	12
11	13
12	16
13	17
14	19
15	21
16	23
17	24
18	27
19	28
20	31
21	33
22	35
23	36
24	40
25	41
26	43
27	45
28	48
29	49
30	53
31	54
32	57
33	59
34	61
35	63
36	67
37	68
38	70
39	72
40	76
41	77
42	81
43	82
44	85
45	88
46	90
47	91
48	96
49	97
50	100
51	102
52	105
53	106
54	110
55	112
56	116
57	118
58	120
59	121
60	127
61	128
62	130
63	133
64	136