A375109 - cp's OEIS frontend

A375109 Number of distinct products i*j with 1 <= i, j <= n which are not the sum of two numbers between 1 and n.

n	a(n)
1	1
2	1
3	2
4	4
5	6
6	9
7	14
8	17
9	22
10	27
11	35
12	40
13	50
14	56
15	64
16	71
17	85
18	92
19	109
20	117
21	128
22	139
23	159
24	168
25	182
26	194
27	208
28	219
29	245
30	256
31	285
32	298
33	314
34	331
35	349
36	361
37	396
38	414
39	433
40	448
41	486
42	502
43	542
44	560
45	580
46	602
47	646
48	661
49	691
50	711
51	737
52	759
53	809

[1, 1, 2, 4, 6, 9, 14, 17, 22, 27, 35, 40, 50, 56, 64, 71, 85, 92, 109, 117, 128, 139, 159, 168, 182, 194, 208, 219, 245, 256, 285, 298, 314, 331, 349, 361, 396, 414, 433, 448, 486, 502, 542, 560, 580, 602, 646, 661, 691, 711, 737, 759, 809]

cp's OEIS Frontend

A375109 Number of distinct products i*j with 1 <= i, j <= n which are not the sum of two numbers between 1 and n.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	4
5	6
6	9
7	14
8	17
9	22
10	27
11	35
12	40
13	50
14	56
15	64
16	71
17	85
18	92
19	109
20	117
21	128
22	139
23	159
24	168
25	182
26	194
27	208
28	219
29	245
30	256
31	285
32	298
33	314
34	331
35	349
36	361
37	396
38	414
39	433
40	448
41	486
42	502
43	542
44	560
45	580
46	602
47	646
48	661
49	691
50	711
51	737
52	759
53	809

n	a(n)
1	1
2	1
3	2
4	4
5	6
6	9
7	14
8	17
9	22
10	27
11	35
12	40
13	50
14	56
15	64
16	71
17	85
18	92
19	109
20	117
21	128
22	139
23	159
24	168
25	182
26	194
27	208
28	219
29	245
30	256
31	285
32	298
33	314
34	331
35	349
36	361
37	396
38	414
39	433
40	448
41	486
42	502
43	542
44	560
45	580
46	602
47	646
48	661
49	691
50	711
51	737
52	759
53	809

n	a(n)
1	1
2	1
3	2
4	4
5	6
6	9
7	14
8	17
9	22
10	27
11	35
12	40
13	50
14	56
15	64
16	71
17	85
18	92
19	109
20	117
21	128
22	139
23	159
24	168
25	182
26	194
27	208
28	219
29	245
30	256
31	285
32	298
33	314
34	331
35	349
36	361
37	396
38	414
39	433
40	448
41	486
42	502
43	542
44	560
45	580
46	602
47	646
48	661
49	691
50	711
51	737
52	759
53	809