A247979 - cp's OEIS frontend

A247979 Numbers of the form x^2 + 7y^2 with x, y integers, or x^2/4 + 7y^2/4 with x, y odd integers.

n	a(n)
1	0
2	1
3	2
4	4
5	7
6	8
7	9
8	11
9	14
10	16
11	18
12	21
13	22
14	23
15	25
16	28
17	29
18	32
19	36
20	37
21	43
22	44
23	46
24	49
25	50
26	53
27	56
28	58
29	63
30	64
31	67
32	71
33	72
34	74
35	77
36	79
37	81
38	86
39	88
40	92
41	98
42	99
43	100
44	106
45	107
46	109
47	112
48	113
49	116
50	121
51	126
52	127
53	128
54	134
55	137
56	142
57	144
58	148
59	149
60	151
61	154
62	158
63	161
64	162
65	163
66	169
67	172

[0, 1, 2, 4, 7, 8, 9, 11, 14, 16, 18, 21, 22, 23, 25, 28, 29, 32, 36, 37, 43, 44, 46, 49, 50, 53, 56, 58, 63, 64, 67, 71, 72, 74, 77, 79, 81, 86, 88, 92, 98, 99, 100, 106, 107, 109, 112, 113, 116, 121, 126, 127, 128, 134, 137, 142, 144, 148, 149, 151, 154, 158, 161, 162, 163, 169, 172]

cp's OEIS Frontend

A247979 Numbers of the form x^2 + 7y^2 with x, y integers, or x^2/4 + 7y^2/4 with x, y odd integers.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	4
5	7
6	8
7	9
8	11
9	14
10	16
11	18
12	21
13	22
14	23
15	25
16	28
17	29
18	32
19	36
20	37
21	43
22	44
23	46
24	49
25	50
26	53
27	56
28	58
29	63
30	64
31	67
32	71
33	72
34	74
35	77
36	79
37	81
38	86
39	88
40	92
41	98
42	99
43	100
44	106
45	107
46	109
47	112
48	113
49	116
50	121
51	126
52	127
53	128
54	134
55	137
56	142
57	144
58	148
59	149
60	151
61	154
62	158
63	161
64	162
65	163
66	169
67	172

n	a(n)
1	0
2	1
3	2
4	4
5	7
6	8
7	9
8	11
9	14
10	16
11	18
12	21
13	22
14	23
15	25
16	28
17	29
18	32
19	36
20	37
21	43
22	44
23	46
24	49
25	50
26	53
27	56
28	58
29	63
30	64
31	67
32	71
33	72
34	74
35	77
36	79
37	81
38	86
39	88
40	92
41	98
42	99
43	100
44	106
45	107
46	109
47	112
48	113
49	116
50	121
51	126
52	127
53	128
54	134
55	137
56	142
57	144
58	148
59	149
60	151
61	154
62	158
63	161
64	162
65	163
66	169
67	172

n	a(n)
1	0
2	1
3	2
4	4
5	7
6	8
7	9
8	11
9	14
10	16
11	18
12	21
13	22
14	23
15	25
16	28
17	29
18	32
19	36
20	37
21	43
22	44
23	46
24	49
25	50
26	53
27	56
28	58
29	63
30	64
31	67
32	71
33	72
34	74
35	77
36	79
37	81
38	86
39	88
40	92
41	98
42	99
43	100
44	106
45	107
46	109
47	112
48	113
49	116
50	121
51	126
52	127
53	128
54	134
55	137
56	142
57	144
58	148
59	149
60	151
61	154
62	158
63	161
64	162
65	163
66	169
67	172