A301579 - cp's OEIS frontend

A301579 Least nonnegative integer k such that n^2 - 32^k can be written as x^2 + 2y^2 with x and y integers, or -1 if no such k exists.

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

[-1, 0, 0, 2, 0, 0, 1, 4, 1, 0, 0, 2, 0, 0, 1, 6, 1, 0, 0, 2, 0, 2, 1, 4, 1, 0, 0, 2, 0, 3, 3, 8, 1, 0, 3, 2, 0, 0, 3, 4, 1, 0, 1, 4, 0, 0, 1, 6, 3, 0, 0, 2, 1, 0, 1, 4, 3, 0, 1, 5, 0, 5, 1, 10, 1, 0, 0, 2, 3, 0, 4, 4, 1, 2, 0, 2, 0, 0, 3, 6]

cp's OEIS Frontend

A301579 Least nonnegative integer k such that n^2 - 32^k can be written as x^2 + 2y^2 with x and y integers, or -1 if no such k exists.

Table of values

List of values

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

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

cp's OEIS Frontend

A301579 Least nonnegative integer k such that n^2 - 3*2^k can be written as x^2 + 2*y^2 with x and y integers, or -1 if no such k exists.

Table of values

List of values

A301579 Least nonnegative integer k such that n^2 - 32^k can be written as x^2 + 2y^2 with x and y integers, or -1 if no such k exists.

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