A063647 - cp's OEIS frontend

A063647 Number of ways to write 1/n as a difference of exactly 2 unit fractions.

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	4
7	1
8	3
9	2
10	4
11	1
12	7
13	1
14	4
15	4
16	4
17	1
18	7
19	1
20	7
21	4
22	4
23	1
24	10
25	2
26	4
27	3
28	7
29	1
30	13
31	1
32	5
33	4
34	4
35	4
36	12
37	1
38	4
39	4
40	10
41	1
42	13
43	1
44	7
45	7
46	4
47	1
48	13
49	2
50	7
51	4
52	7
53	1
54	10
55	4
56	10
57	4
58	4
59	1
60	22
61	1
62	4
63	7
64	6
65	4
66	13
67	1
68	7
69	4
70	13
71	1
72	17
73	1
74	4
75	7
76	7
77	4
78	13
79	1
80	13
81	4
82	4
83	1
84	22
85	4
86	4
87	4
88	10
89	1
90	22
91	4
92	7
93	4
94	4
95	4

[0, 1, 1, 2, 1, 4, 1, 3, 2, 4, 1, 7, 1, 4, 4, 4, 1, 7, 1, 7, 4, 4, 1, 10, 2, 4, 3, 7, 1, 13, 1, 5, 4, 4, 4, 12, 1, 4, 4, 10, 1, 13, 1, 7, 7, 4, 1, 13, 2, 7, 4, 7, 1, 10, 4, 10, 4, 4, 1, 22, 1, 4, 7, 6, 4, 13, 1, 7, 4, 13, 1, 17, 1, 4, 7, 7, 4, 13, 1, 13, 4, 4, 1, 22, 4, 4, 4, 10, 1, 22, 4, 7, 4, 4, 4]

cp's OEIS Frontend

A063647 Number of ways to write 1/n as a difference of exactly 2 unit fractions.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	4
7	1
8	3
9	2
10	4
11	1
12	7
13	1
14	4
15	4
16	4
17	1
18	7
19	1
20	7
21	4
22	4
23	1
24	10
25	2
26	4
27	3
28	7
29	1
30	13
31	1
32	5
33	4
34	4
35	4
36	12
37	1
38	4
39	4
40	10
41	1
42	13
43	1
44	7
45	7
46	4
47	1
48	13
49	2
50	7
51	4
52	7
53	1
54	10
55	4
56	10
57	4
58	4
59	1
60	22
61	1
62	4
63	7
64	6
65	4
66	13
67	1
68	7
69	4
70	13
71	1
72	17
73	1
74	4
75	7
76	7
77	4
78	13
79	1
80	13
81	4
82	4
83	1
84	22
85	4
86	4
87	4
88	10
89	1
90	22
91	4
92	7
93	4
94	4
95	4

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	4
7	1
8	3
9	2
10	4
11	1
12	7
13	1
14	4
15	4
16	4
17	1
18	7
19	1
20	7
21	4
22	4
23	1
24	10
25	2
26	4
27	3
28	7
29	1
30	13
31	1
32	5
33	4
34	4
35	4
36	12
37	1
38	4
39	4
40	10
41	1
42	13
43	1
44	7
45	7
46	4
47	1
48	13
49	2
50	7
51	4
52	7
53	1
54	10
55	4
56	10
57	4
58	4
59	1
60	22
61	1
62	4
63	7
64	6
65	4
66	13
67	1
68	7
69	4
70	13
71	1
72	17
73	1
74	4
75	7
76	7
77	4
78	13
79	1
80	13
81	4
82	4
83	1
84	22
85	4
86	4
87	4
88	10
89	1
90	22
91	4
92	7
93	4
94	4
95	4

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	4
7	1
8	3
9	2
10	4
11	1
12	7
13	1
14	4
15	4
16	4
17	1
18	7
19	1
20	7
21	4
22	4
23	1
24	10
25	2
26	4
27	3
28	7
29	1
30	13
31	1
32	5
33	4
34	4
35	4
36	12
37	1
38	4
39	4
40	10
41	1
42	13
43	1
44	7
45	7
46	4
47	1
48	13
49	2
50	7
51	4
52	7
53	1
54	10
55	4
56	10
57	4
58	4
59	1
60	22
61	1
62	4
63	7
64	6
65	4
66	13
67	1
68	7
69	4
70	13
71	1
72	17
73	1
74	4
75	7
76	7
77	4
78	13
79	1
80	13
81	4
82	4
83	1
84	22
85	4
86	4
87	4
88	10
89	1
90	22
91	4
92	7
93	4
94	4
95	4