A379816 - cp's OEIS frontend

A379816 a(n) is the smallest integer k > n such that sqrt(1/n - 1/k) is a rational number; or 0 if no such k exists.

n	a(n)
1	0
2	4
3	12
4	0
5	25
6	18
7	448
8	16
9	12
10	100
11	1100
12	18
13	4225
14	112
15	240
16	18
17	289
18	36
19	549100
20	25
21	588
22	2178
23	13248
24	72
25	45
26	676
27	108
28	126
29	142129
30	180
31	71622400
32	64
33	396
34	612
35	1260
36	48
37	1369
38	722
39	507
40	400
41	42025
42	294
43	521345932
44	242
45	225
46	559728
47	108288
48	72
49	112
50	100
51	127500
52	169
53	1755625
54	162
55	2475
56	448
57	4332
58	568516
59	16573100
60	150

[0, 4, 12, 0, 25, 18, 448, 16, 12, 100, 1100, 18, 4225, 112, 240, 18, 289, 36, 549100, 25, 588, 2178, 13248, 72, 45, 676, 108, 126, 142129, 180, 71622400, 64, 396, 612, 1260, 48, 1369, 722, 507, 400, 42025, 294, 521345932, 242, 225, 559728, 108288, 72, 112, 100, 127500, 169, 1755625, 162, 2475, 448, 4332, 568516, 16573100, 150]

cp's OEIS Frontend

A379816 a(n) is the smallest integer k > n such that sqrt(1/n - 1/k) is a rational number; or 0 if no such k exists.

Table of values

List of values