A198772 - cp's OEIS frontend

A198772 Numbers having exactly one representation by the quadratic form x^2 + xy + y^2 with 0 <= x <= y.

n	a(n)
1	0
2	1
3	3
4	4
5	7
6	9
7	12
8	13
9	16
10	19
11	21
12	25
13	27
14	28
15	31
16	36
17	37
18	39
19	43
20	48
21	52
22	57
23	61
24	63
25	64
26	67
27	73
28	75
29	76
30	79
31	81
32	84
33	93
34	97
35	100
36	103
37	108
38	109
39	111
40	112
41	117
42	121
43	124
44	127
45	129
46	139
47	144
48	148
49	151
50	156
51	157
52	163
53	171
54	172
55	175
56	181
57	183
58	189
59	192
60	193

[0, 1, 3, 4, 7, 9, 12, 13, 16, 19, 21, 25, 27, 28, 31, 36, 37, 39, 43, 48, 52, 57, 61, 63, 64, 67, 73, 75, 76, 79, 81, 84, 93, 97, 100, 103, 108, 109, 111, 112, 117, 121, 124, 127, 129, 139, 144, 148, 151, 156, 157, 163, 171, 172, 175, 181, 183, 189, 192, 193]

cp's OEIS Frontend

A198772 Numbers having exactly one representation by the quadratic form x^2 + xy + y^2 with 0 <= x <= y.

Table of values

List of values

n	a(n)
1	0
2	1
3	3
4	4
5	7
6	9
7	12
8	13
9	16
10	19
11	21
12	25
13	27
14	28
15	31
16	36
17	37
18	39
19	43
20	48
21	52
22	57
23	61
24	63
25	64
26	67
27	73
28	75
29	76
30	79
31	81
32	84
33	93
34	97
35	100
36	103
37	108
38	109
39	111
40	112
41	117
42	121
43	124
44	127
45	129
46	139
47	144
48	148
49	151
50	156
51	157
52	163
53	171
54	172
55	175
56	181
57	183
58	189
59	192
60	193

n	a(n)
1	0
2	1
3	3
4	4
5	7
6	9
7	12
8	13
9	16
10	19
11	21
12	25
13	27
14	28
15	31
16	36
17	37
18	39
19	43
20	48
21	52
22	57
23	61
24	63
25	64
26	67
27	73
28	75
29	76
30	79
31	81
32	84
33	93
34	97
35	100
36	103
37	108
38	109
39	111
40	112
41	117
42	121
43	124
44	127
45	129
46	139
47	144
48	148
49	151
50	156
51	157
52	163
53	171
54	172
55	175
56	181
57	183
58	189
59	192
60	193

n	a(n)
1	0
2	1
3	3
4	4
5	7
6	9
7	12
8	13
9	16
10	19
11	21
12	25
13	27
14	28
15	31
16	36
17	37
18	39
19	43
20	48
21	52
22	57
23	61
24	63
25	64
26	67
27	73
28	75
29	76
30	79
31	81
32	84
33	93
34	97
35	100
36	103
37	108
38	109
39	111
40	112
41	117
42	121
43	124
44	127
45	129
46	139
47	144
48	148
49	151
50	156
51	157
52	163
53	171
54	172
55	175
56	181
57	183
58	189
59	192
60	193