A232177 - cp's OEIS frontend

A232177 Least positive k such that triangular(n) + triangular(k) is a square.

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

[1, 2, 1, 2, 3, 1, 5, 6, 7, 8, 9, 5, 2, 12, 13, 1, 15, 16, 17, 3, 5, 20, 2, 22, 23, 8, 4, 26, 12, 3, 29, 30, 1, 5, 33, 34, 4, 36, 37, 15, 6, 29, 22, 5, 43, 19, 45, 7, 15, 48, 6, 50, 11, 52, 8, 41, 22, 7, 57, 58, 59, 9, 26, 62, 8, 64, 19, 66, 10, 68, 5, 9, 71, 2]

cp's OEIS Frontend

A232177 Least positive k such that triangular(n) + triangular(k) is a square.

Table of values

List of values

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

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

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