A003991 - cp's OEIS frontend

A003991 Multiplication table read by antidiagonals: T(i,j) = i*j, i>=1, j>=1.

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

[1, 2, 2, 3, 4, 3, 4, 6, 6, 4, 5, 8, 9, 8, 5, 6, 10, 12, 12, 10, 6, 7, 12, 15, 16, 15, 12, 7, 8, 14, 18, 20, 20, 18, 14, 8, 9, 16, 21, 24, 25, 24, 21, 16, 9, 10, 18, 24, 28, 30, 30, 28, 24, 18, 10, 11, 20, 27, 32, 35, 36, 35, 32, 27, 20, 11, 12, 22, 30, 36, 40, 42, 42, 40, 36, 30, 22, 12]

cp's OEIS Frontend

A003991 Multiplication table read by antidiagonals: T(i,j) = i*j, i>=1, j>=1.

Table of values

List of values

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

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

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