A378723 - cp's OEIS frontend

A378723 Triangle read by rows: row n gives denominators of n distinct unit fractions (or Egyptian fractions) summing to 1, where denominators are listed in increasing order and the denominators from largest to smallest are as small as possible.

n	a(n)
1	1
2	0
3	0
4	2
5	3
6	6
7	2
8	4
9	6
10	12
11	2
12	4
13	10
14	12
15	15
16	3
17	4
18	6
19	10
20	12
21	15
22	3
23	4
24	9
25	10
26	12
27	15
28	18
29	4
30	5
31	6
32	9
33	10
34	15
35	18
36	20
37	4
38	6
39	8
40	9
41	10
42	12
43	15
44	18
45	24
46	5
47	6
48	8
49	9
50	10
51	12
52	15
53	18
54	20
55	24
56	6
57	7
58	8
59	9
60	10
61	12
62	14
63	15
64	18
65	24
66	28
67	6
68	7
69	8
70	9
71	10
72	14
73	15
74	18
75	20
76	24
77	28
78	30

[1, 0, 0, 2, 3, 6, 2, 4, 6, 12, 2, 4, 10, 12, 15, 3, 4, 6, 10, 12, 15, 3, 4, 9, 10, 12, 15, 18, 4, 5, 6, 9, 10, 15, 18, 20, 4, 6, 8, 9, 10, 12, 15, 18, 24, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 6, 7, 8, 9, 10, 12, 14, 15, 18, 24, 28, 6, 7, 8, 9, 10, 14, 15, 18, 20, 24, 28, 30]

cp's OEIS Frontend

A378723 Triangle read by rows: row n gives denominators of n distinct unit fractions (or Egyptian fractions) summing to 1, where denominators are listed in increasing order and the denominators from largest to smallest are as small as possible.

Table of values

List of values

n	a(n)
1	1
2	0
3	0
4	2
5	3
6	6
7	2
8	4
9	6
10	12
11	2
12	4
13	10
14	12
15	15
16	3
17	4
18	6
19	10
20	12
21	15
22	3
23	4
24	9
25	10
26	12
27	15
28	18
29	4
30	5
31	6
32	9
33	10
34	15
35	18
36	20
37	4
38	6
39	8
40	9
41	10
42	12
43	15
44	18
45	24
46	5
47	6
48	8
49	9
50	10
51	12
52	15
53	18
54	20
55	24
56	6
57	7
58	8
59	9
60	10
61	12
62	14
63	15
64	18
65	24
66	28
67	6
68	7
69	8
70	9
71	10
72	14
73	15
74	18
75	20
76	24
77	28
78	30

n	a(n)
1	1
2	0
3	0
4	2
5	3
6	6
7	2
8	4
9	6
10	12
11	2
12	4
13	10
14	12
15	15
16	3
17	4
18	6
19	10
20	12
21	15
22	3
23	4
24	9
25	10
26	12
27	15
28	18
29	4
30	5
31	6
32	9
33	10
34	15
35	18
36	20
37	4
38	6
39	8
40	9
41	10
42	12
43	15
44	18
45	24
46	5
47	6
48	8
49	9
50	10
51	12
52	15
53	18
54	20
55	24
56	6
57	7
58	8
59	9
60	10
61	12
62	14
63	15
64	18
65	24
66	28
67	6
68	7
69	8
70	9
71	10
72	14
73	15
74	18
75	20
76	24
77	28
78	30

n	a(n)
1	1
2	0
3	0
4	2
5	3
6	6
7	2
8	4
9	6
10	12
11	2
12	4
13	10
14	12
15	15
16	3
17	4
18	6
19	10
20	12
21	15
22	3
23	4
24	9
25	10
26	12
27	15
28	18
29	4
30	5
31	6
32	9
33	10
34	15
35	18
36	20
37	4
38	6
39	8
40	9
41	10
42	12
43	15
44	18
45	24
46	5
47	6
48	8
49	9
50	10
51	12
52	15
53	18
54	20
55	24
56	6
57	7
58	8
59	9
60	10
61	12
62	14
63	15
64	18
65	24
66	28
67	6
68	7
69	8
70	9
71	10
72	14
73	15
74	18
75	20
76	24
77	28
78	30