A316296 - cp's OEIS frontend

A316296 a(n) = Sum_{k=1..n} f(k, n), where f(i, j) is the number of multiples of i greater than j and less than 2*j.

n	a(n)
1	0
2	1
3	3
4	5
5	9
6	10
7	15
8	18
9	21
10	24
11	31
12	30
13	38
14	41
15	44
16	48
17	55
18	56
19	64
20	65
21	70
22	75
23	84
24	81
25	90
26	95
27	98
28	103
29	112
30	109
31	120
32	123
33	129
34	134
35	139
36	139
37	150
38	155
39	160
40	161
41	173
42	170
43	183
44	184
45	187
46	198
47	205
48	202
49	212
50	217
51	223
52	226
53	239
54	236
55	245
56	248
57	255
58	262
59	271
60	266
61	282
62	285
63	288

[0, 1, 3, 5, 9, 10, 15, 18, 21, 24, 31, 30, 38, 41, 44, 48, 55, 56, 64, 65, 70, 75, 84, 81, 90, 95, 98, 103, 112, 109, 120, 123, 129, 134, 139, 139, 150, 155, 160, 161, 173, 170, 183, 184, 187, 198, 205, 202, 212, 217, 223, 226, 239, 236, 245, 248, 255, 262, 271, 266, 282, 285, 288]

cp's OEIS Frontend

A316296 a(n) = Sum_{k=1..n} f(k, n), where f(i, j) is the number of multiples of i greater than j and less than 2*j.

Table of values

List of values

n	a(n)
1	0
2	1
3	3
4	5
5	9
6	10
7	15
8	18
9	21
10	24
11	31
12	30
13	38
14	41
15	44
16	48
17	55
18	56
19	64
20	65
21	70
22	75
23	84
24	81
25	90
26	95
27	98
28	103
29	112
30	109
31	120
32	123
33	129
34	134
35	139
36	139
37	150
38	155
39	160
40	161
41	173
42	170
43	183
44	184
45	187
46	198
47	205
48	202
49	212
50	217
51	223
52	226
53	239
54	236
55	245
56	248
57	255
58	262
59	271
60	266
61	282
62	285
63	288

n	a(n)
1	0
2	1
3	3
4	5
5	9
6	10
7	15
8	18
9	21
10	24
11	31
12	30
13	38
14	41
15	44
16	48
17	55
18	56
19	64
20	65
21	70
22	75
23	84
24	81
25	90
26	95
27	98
28	103
29	112
30	109
31	120
32	123
33	129
34	134
35	139
36	139
37	150
38	155
39	160
40	161
41	173
42	170
43	183
44	184
45	187
46	198
47	205
48	202
49	212
50	217
51	223
52	226
53	239
54	236
55	245
56	248
57	255
58	262
59	271
60	266
61	282
62	285
63	288

n	a(n)
1	0
2	1
3	3
4	5
5	9
6	10
7	15
8	18
9	21
10	24
11	31
12	30
13	38
14	41
15	44
16	48
17	55
18	56
19	64
20	65
21	70
22	75
23	84
24	81
25	90
26	95
27	98
28	103
29	112
30	109
31	120
32	123
33	129
34	134
35	139
36	139
37	150
38	155
39	160
40	161
41	173
42	170
43	183
44	184
45	187
46	198
47	205
48	202
49	212
50	217
51	223
52	226
53	239
54	236
55	245
56	248
57	255
58	262
59	271
60	266
61	282
62	285
63	288