A028951 - cp's OEIS frontend

A028951 Numbers represented by quadratic form with Gram matrix [ 2, 1; 1, 4 ] (or the Kleinian 2-d lattice, see A002652).

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	22
13	23
14	25
15	28
16	29
17	32
18	36
19	37
20	43
21	44
22	46
23	49
24	50
25	53
26	56
27	58
28	63
29	64
30	67
31	71
32	72
33	74
34	77
35	79
36	81
37	86
38	88
39	92
40	98
41	99
42	100
43	106
44	107
45	109
46	112
47	113
48	116
49	121
50	126
51	127
52	128
53	134
54	137
55	142
56	144
57	148
58	149
59	151
60	154
61	158
62	161
63	162

[0, 1, 2, 4, 7, 8, 9, 11, 14, 16, 18, 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]

cp's OEIS Frontend

A028951 Numbers represented by quadratic form with Gram matrix [ 2, 1; 1, 4 ] (or the Kleinian 2-d lattice, see A002652).

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	22
13	23
14	25
15	28
16	29
17	32
18	36
19	37
20	43
21	44
22	46
23	49
24	50
25	53
26	56
27	58
28	63
29	64
30	67
31	71
32	72
33	74
34	77
35	79
36	81
37	86
38	88
39	92
40	98
41	99
42	100
43	106
44	107
45	109
46	112
47	113
48	116
49	121
50	126
51	127
52	128
53	134
54	137
55	142
56	144
57	148
58	149
59	151
60	154
61	158
62	161
63	162

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	22
13	23
14	25
15	28
16	29
17	32
18	36
19	37
20	43
21	44
22	46
23	49
24	50
25	53
26	56
27	58
28	63
29	64
30	67
31	71
32	72
33	74
34	77
35	79
36	81
37	86
38	88
39	92
40	98
41	99
42	100
43	106
44	107
45	109
46	112
47	113
48	116
49	121
50	126
51	127
52	128
53	134
54	137
55	142
56	144
57	148
58	149
59	151
60	154
61	158
62	161
63	162

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	22
13	23
14	25
15	28
16	29
17	32
18	36
19	37
20	43
21	44
22	46
23	49
24	50
25	53
26	56
27	58
28	63
29	64
30	67
31	71
32	72
33	74
34	77
35	79
36	81
37	86
38	88
39	92
40	98
41	99
42	100
43	106
44	107
45	109
46	112
47	113
48	116
49	121
50	126
51	127
52	128
53	134
54	137
55	142
56	144
57	148
58	149
59	151
60	154
61	158
62	161
63	162