A119345 - cp's OEIS frontend

A119345 Numbers having exactly one representation as sum of two triangular numbers.

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	7
7	9
8	10
9	11
10	12
11	13
12	15
13	18
14	20
15	22
16	24
17	25
18	27
19	28
20	29
21	30
22	34
23	37
24	38
25	39
26	43
27	45
28	48
29	49
30	57
31	58
32	60
33	61
34	64
35	65
36	67
37	69
38	70
39	73
40	78
41	79
42	83
43	84
44	87
45	88
46	90
47	92
48	93
49	97
50	99
51	100
52	101
53	102
54	105
55	108
56	110
57	112
58	114
59	115
60	119
61	127
62	130
63	132
64	135
65	137
66	139
67	142

[0, 1, 2, 3, 4, 7, 9, 10, 11, 12, 13, 15, 18, 20, 22, 24, 25, 27, 28, 29, 30, 34, 37, 38, 39, 43, 45, 48, 49, 57, 58, 60, 61, 64, 65, 67, 69, 70, 73, 78, 79, 83, 84, 87, 88, 90, 92, 93, 97, 99, 100, 101, 102, 105, 108, 110, 112, 114, 115, 119, 127, 130, 132, 135, 137, 139, 142]

cp's OEIS Frontend

A119345 Numbers having exactly one representation as sum of two triangular numbers.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	7
7	9
8	10
9	11
10	12
11	13
12	15
13	18
14	20
15	22
16	24
17	25
18	27
19	28
20	29
21	30
22	34
23	37
24	38
25	39
26	43
27	45
28	48
29	49
30	57
31	58
32	60
33	61
34	64
35	65
36	67
37	69
38	70
39	73
40	78
41	79
42	83
43	84
44	87
45	88
46	90
47	92
48	93
49	97
50	99
51	100
52	101
53	102
54	105
55	108
56	110
57	112
58	114
59	115
60	119
61	127
62	130
63	132
64	135
65	137
66	139
67	142

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	7
7	9
8	10
9	11
10	12
11	13
12	15
13	18
14	20
15	22
16	24
17	25
18	27
19	28
20	29
21	30
22	34
23	37
24	38
25	39
26	43
27	45
28	48
29	49
30	57
31	58
32	60
33	61
34	64
35	65
36	67
37	69
38	70
39	73
40	78
41	79
42	83
43	84
44	87
45	88
46	90
47	92
48	93
49	97
50	99
51	100
52	101
53	102
54	105
55	108
56	110
57	112
58	114
59	115
60	119
61	127
62	130
63	132
64	135
65	137
66	139
67	142

n	a(n)
1	0
2	1
3	2
4	3
5	4
6	7
7	9
8	10
9	11
10	12
11	13
12	15
13	18
14	20
15	22
16	24
17	25
18	27
19	28
20	29
21	30
22	34
23	37
24	38
25	39
26	43
27	45
28	48
29	49
30	57
31	58
32	60
33	61
34	64
35	65
36	67
37	69
38	70
39	73
40	78
41	79
42	83
43	84
44	87
45	88
46	90
47	92
48	93
49	97
50	99
51	100
52	101
53	102
54	105
55	108
56	110
57	112
58	114
59	115
60	119
61	127
62	130
63	132
64	135
65	137
66	139
67	142