A370574 - cp's OEIS frontend

A370574 a(n) is the least k > 0 such that n^2 XOR k^2 is a positive square number (where XOR denotes the bitwise XOR operator), or -1 if no such k exists.

n	a(n)
1	-1
2	-1
3	4
4	3
5	3
6	8
7	24
8	6
9	23
10	6
11	44
12	16
13	43
14	48
15	36
16	12
17	111
18	46
19	180
20	12
21	72
22	88
23	9
24	7
25	7
26	86
27	20
28	59
29	20
30	72
31	56
32	24
33	479
34	222
35	20
36	15
37	20
38	360
39	15
40	24
41	183
42	144
43	13
44	11
45	11
46	18
47	943
48	14
49	1103
50	14
51	747
52	172
53	405
54	40
55	159
56	31
57	492
58	40
59	28
60	144
61	28
62	112
63	31
64	48
65	660

[-1, -1, 4, 3, 3, 8, 24, 6, 23, 6, 44, 16, 43, 48, 36, 12, 111, 46, 180, 12, 72, 88, 9, 7, 7, 86, 20, 59, 20, 72, 56, 24, 479, 222, 20, 15, 20, 360, 15, 24, 183, 144, 13, 11, 11, 18, 943, 14, 1103, 14, 747, 172, 405, 40, 159, 31, 492, 40, 28, 144, 28, 112, 31, 48, 660]

cp's OEIS Frontend

A370574 a(n) is the least k > 0 such that n^2 XOR k^2 is a positive square number (where XOR denotes the bitwise XOR operator), or -1 if no such k exists.

Table of values

List of values