A067721 - cp's OEIS frontend

A067721 Least number k such that k (k + n) is a perfect square, or 0 if impossible.

n	a(n)
0	1
1	0
2	0
3	1
4	0
5	4
6	2
7	9
8	1
9	3
10	8
11	25
12	4
13	36
14	18
15	1
16	2
17	64
18	6
19	81
20	16
21	4
22	50
23	121
24	1
25	20
26	72
27	9
28	36
29	196
30	2
31	225
32	4
33	11
34	128
35	1
36	12
37	324
38	162
39	13
40	5
41	400
42	8
43	441
44	100
45	3
46	242
47	529
48	1
49	63
50	40
51	17
52	144
53	676
54	18
55	9
56	7
57	19
58	392
59	841
60	4
61	900
62	450
63	1
64	8
65	16
66	22
67	1089
68	256
69	23
70	2
71	1225

[1, 0, 0, 1, 0, 4, 2, 9, 1, 3, 8, 25, 4, 36, 18, 1, 2, 64, 6, 81, 16, 4, 50, 121, 1, 20, 72, 9, 36, 196, 2, 225, 4, 11, 128, 1, 12, 324, 162, 13, 5, 400, 8, 441, 100, 3, 242, 529, 1, 63, 40, 17, 144, 676, 18, 9, 7, 19, 392, 841, 4, 900, 450, 1, 8, 16, 22, 1089, 256, 23, 2, 1225]

cp's OEIS Frontend

A067721 Least number k such that k (k + n) is a perfect square, or 0 if impossible.

Table of values

List of values