A379815 - cp's OEIS frontend

A379815 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	16
3	9
4	0
5	20
6	12
7	441
8	64
9	16
10	90
11	1089
12	36
13	4212
14	98
15	225
16	0
17	272
18	144
19	549081
20	25
21	567
22	2156
23	13225
24	48
25	144
26	650
27	81
28	98
29	142100
30	150
31	71622369
32	256
33	363
34	578
35	1225
36	64
37	1332
38	684
39	468
40	360
41	41984
42	252
43	521345889
44	198
45	180
46	559682
47	108241
48	144
49	63
50	400
51	127449
52	117
53	1755572
54	108
55	2420
56	392
57	4275
58	568458

[0, 16, 9, 0, 20, 12, 441, 64, 16, 90, 1089, 36, 4212, 98, 225, 0, 272, 144, 549081, 25, 567, 2156, 13225, 48, 144, 650, 81, 98, 142100, 150, 71622369, 256, 363, 578, 1225, 64, 1332, 684, 468, 360, 41984, 252, 521345889, 198, 180, 559682, 108241, 144, 63, 400, 127449, 117, 1755572, 108, 2420, 392, 4275, 568458]

cp's OEIS Frontend

A379815 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