A260819 - cp's OEIS frontend

A260819 Positive integer solutions [a',b',c',d'] of the equation 1/a + 1/b + 1/c + 1/d = 1, for a <= b <= c <= d, lexicographically sorted.

n	a(n)
1	2
2	3
3	7
4	42
5	2
6	3
7	8
8	24
9	2
10	3
11	9
12	18
13	2
14	3
15	10
16	15
17	2
18	3
19	12
20	12
21	2
22	4
23	5
24	20
25	2
26	4
27	6
28	12
29	2
30	4
31	8
32	8
33	2
34	5
35	5
36	10
37	2
38	6
39	6
40	6
41	3
42	3
43	4
44	12
45	3
46	3
47	6
48	6
49	3
50	4
51	4
52	6
53	4
54	4
55	4
56	4

[2, 3, 7, 42, 2, 3, 8, 24, 2, 3, 9, 18, 2, 3, 10, 15, 2, 3, 12, 12, 2, 4, 5, 20, 2, 4, 6, 12, 2, 4, 8, 8, 2, 5, 5, 10, 2, 6, 6, 6, 3, 3, 4, 12, 3, 3, 6, 6, 3, 4, 4, 6, 4, 4, 4, 4]

cp's OEIS Frontend

A260819 Positive integer solutions [a',b',c',d'] of the equation 1/a + 1/b + 1/c + 1/d = 1, for a <= b <= c <= d, lexicographically sorted.

Table of values

List of values

n	a(n)
1	2
2	3
3	7
4	42
5	2
6	3
7	8
8	24
9	2
10	3
11	9
12	18
13	2
14	3
15	10
16	15
17	2
18	3
19	12
20	12
21	2
22	4
23	5
24	20
25	2
26	4
27	6
28	12
29	2
30	4
31	8
32	8
33	2
34	5
35	5
36	10
37	2
38	6
39	6
40	6
41	3
42	3
43	4
44	12
45	3
46	3
47	6
48	6
49	3
50	4
51	4
52	6
53	4
54	4
55	4
56	4

n	a(n)
1	2
2	3
3	7
4	42
5	2
6	3
7	8
8	24
9	2
10	3
11	9
12	18
13	2
14	3
15	10
16	15
17	2
18	3
19	12
20	12
21	2
22	4
23	5
24	20
25	2
26	4
27	6
28	12
29	2
30	4
31	8
32	8
33	2
34	5
35	5
36	10
37	2
38	6
39	6
40	6
41	3
42	3
43	4
44	12
45	3
46	3
47	6
48	6
49	3
50	4
51	4
52	6
53	4
54	4
55	4
56	4

n	a(n)
1	2
2	3
3	7
4	42
5	2
6	3
7	8
8	24
9	2
10	3
11	9
12	18
13	2
14	3
15	10
16	15
17	2
18	3
19	12
20	12
21	2
22	4
23	5
24	20
25	2
26	4
27	6
28	12
29	2
30	4
31	8
32	8
33	2
34	5
35	5
36	10
37	2
38	6
39	6
40	6
41	3
42	3
43	4
44	12
45	3
46	3
47	6
48	6
49	3
50	4
51	4
52	6
53	4
54	4
55	4
56	4