A115009 - cp's OEIS frontend

A115009 Array read by antidiagonals: let V(m,n) = Sum_{i=1..m, j=1..n, gcd(i,j)=1} (m+1-i)(n+1-j), then T(m,n) = 2mn+m+n+2V(m,n), for m >= 0, n >= 0.

n	a(n)
0	0
1	1
2	1
3	2
4	6
5	2
6	3
7	13
8	13
9	3
10	4
11	22
12	28
13	22
14	4
15	5
16	33
17	49
18	49
19	33
20	5
21	6
22	46
23	74
24	86
25	74
26	46
27	6
28	7
29	61
30	105
31	131
32	131
33	105
34	61
35	7
36	8
37	78
38	140
39	188
40	200
41	188
42	140
43	78
44	8
45	9
46	97
47	181
48	251
49	289
50	289
51	251
52	181
53	97
54	9
55	10
56	118
57	226
58	326
59	386
60	418
61	386
62	326
63	226
64	118
65	10
66	11
67	141
68	277

[0, 1, 1, 2, 6, 2, 3, 13, 13, 3, 4, 22, 28, 22, 4, 5, 33, 49, 49, 33, 5, 6, 46, 74, 86, 74, 46, 6, 7, 61, 105, 131, 131, 105, 61, 7, 8, 78, 140, 188, 200, 188, 140, 78, 8, 9, 97, 181, 251, 289, 289, 251, 181, 97, 9, 10, 118, 226, 326, 386, 418, 386, 326, 226, 118, 10, 11, 141, 277]

cp's OEIS Frontend

A115009 Array read by antidiagonals: let V(m,n) = Sum_{i=1..m, j=1..n, gcd(i,j)=1} (m+1-i)(n+1-j), then T(m,n) = 2mn+m+n+2V(m,n), for m >= 0, n >= 0.

Table of values

List of values

n	a(n)
0	0
1	1
2	1
3	2
4	6
5	2
6	3
7	13
8	13
9	3
10	4
11	22
12	28
13	22
14	4
15	5
16	33
17	49
18	49
19	33
20	5
21	6
22	46
23	74
24	86
25	74
26	46
27	6
28	7
29	61
30	105
31	131
32	131
33	105
34	61
35	7
36	8
37	78
38	140
39	188
40	200
41	188
42	140
43	78
44	8
45	9
46	97
47	181
48	251
49	289
50	289
51	251
52	181
53	97
54	9
55	10
56	118
57	226
58	326
59	386
60	418
61	386
62	326
63	226
64	118
65	10
66	11
67	141
68	277

n	a(n)
0	0
1	1
2	1
3	2
4	6
5	2
6	3
7	13
8	13
9	3
10	4
11	22
12	28
13	22
14	4
15	5
16	33
17	49
18	49
19	33
20	5
21	6
22	46
23	74
24	86
25	74
26	46
27	6
28	7
29	61
30	105
31	131
32	131
33	105
34	61
35	7
36	8
37	78
38	140
39	188
40	200
41	188
42	140
43	78
44	8
45	9
46	97
47	181
48	251
49	289
50	289
51	251
52	181
53	97
54	9
55	10
56	118
57	226
58	326
59	386
60	418
61	386
62	326
63	226
64	118
65	10
66	11
67	141
68	277

cp's OEIS Frontend

A115009 Array read by antidiagonals: let V(m,n) = Sum_{i=1..m, j=1..n, gcd(i,j)=1} (m+1-i)*(n+1-j), then T(m,n) = 2*m*n+m+n+2*V(m,n), for m >= 0, n >= 0.

Table of values

List of values

A115009 Array read by antidiagonals: let V(m,n) = Sum_{i=1..m, j=1..n, gcd(i,j)=1} (m+1-i)(n+1-j), then T(m,n) = 2mn+m+n+2V(m,n), for m >= 0, n >= 0.

n	a(n)
0	0
1	1
2	1
3	2
4	6
5	2
6	3
7	13
8	13
9	3
10	4
11	22
12	28
13	22
14	4
15	5
16	33
17	49
18	49
19	33
20	5
21	6
22	46
23	74
24	86
25	74
26	46
27	6
28	7
29	61
30	105
31	131
32	131
33	105
34	61
35	7
36	8
37	78
38	140
39	188
40	200
41	188
42	140
43	78
44	8
45	9
46	97
47	181
48	251
49	289
50	289
51	251
52	181
53	97
54	9
55	10
56	118
57	226
58	326
59	386
60	418
61	386
62	326
63	226
64	118
65	10
66	11
67	141
68	277