A221919 - cp's OEIS frontend

A221919 Triangle of numerators of sum of two unit fractions: 1/n + 1/m, n >= m >= 1.

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

[2, 3, 1, 4, 5, 2, 5, 3, 7, 1, 6, 7, 8, 9, 2, 7, 2, 1, 5, 11, 1, 8, 9, 10, 11, 12, 13, 2, 9, 5, 11, 3, 13, 7, 15, 1, 10, 11, 4, 13, 14, 5, 16, 17, 2, 11, 3, 13, 7, 3, 4, 17, 9, 19, 1, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 2, 13, 7, 5, 1, 17, 1, 19, 5, 7, 11, 23, 1]

cp's OEIS Frontend

A221919 Triangle of numerators of sum of two unit fractions: 1/n + 1/m, n >= m >= 1.

Table of values

List of values

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

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

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