A382244 - cp's OEIS frontend

A382244 Lexicographically earliest sequence of distinct nonnegative integers such that for any n >= 0, n*a(n) is a triangular number (A000217).

n	a(n)
0	0
1	1
2	3
3	2
4	7
5	9
6	6
7	4
8	15
9	5
10	12
11	21
12	10
13	25
14	27
15	8
16	31
17	33
18	35
19	37
20	39
21	11
22	24
23	45
24	22
25	13
26	30
27	14
28	42
29	57
30	26
31	16
32	63
33	17
34	67
35	18
36	56
37	19
38	75
39	20
40	52
41	81
42	28
43	85
44	87
45	23
46	51
47	93
48	95
49	97
50	99
51	46
52	40
53	105
54	60
55	90
56	36
57	29
58	66
59	117
60	54
61	121
62	69
63	32
64	127
65	84
66	58

[0, 1, 3, 2, 7, 9, 6, 4, 15, 5, 12, 21, 10, 25, 27, 8, 31, 33, 35, 37, 39, 11, 24, 45, 22, 13, 30, 14, 42, 57, 26, 16, 63, 17, 67, 18, 56, 19, 75, 20, 52, 81, 28, 85, 87, 23, 51, 93, 95, 97, 99, 46, 40, 105, 60, 90, 36, 29, 66, 117, 54, 121, 69, 32, 127, 84, 58]

cp's OEIS Frontend

A382244 Lexicographically earliest sequence of distinct nonnegative integers such that for any n >= 0, n*a(n) is a triangular number (A000217).

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	2
4	7
5	9
6	6
7	4
8	15
9	5
10	12
11	21
12	10
13	25
14	27
15	8
16	31
17	33
18	35
19	37
20	39
21	11
22	24
23	45
24	22
25	13
26	30
27	14
28	42
29	57
30	26
31	16
32	63
33	17
34	67
35	18
36	56
37	19
38	75
39	20
40	52
41	81
42	28
43	85
44	87
45	23
46	51
47	93
48	95
49	97
50	99
51	46
52	40
53	105
54	60
55	90
56	36
57	29
58	66
59	117
60	54
61	121
62	69
63	32
64	127
65	84
66	58

n	a(n)
0	0
1	1
2	3
3	2
4	7
5	9
6	6
7	4
8	15
9	5
10	12
11	21
12	10
13	25
14	27
15	8
16	31
17	33
18	35
19	37
20	39
21	11
22	24
23	45
24	22
25	13
26	30
27	14
28	42
29	57
30	26
31	16
32	63
33	17
34	67
35	18
36	56
37	19
38	75
39	20
40	52
41	81
42	28
43	85
44	87
45	23
46	51
47	93
48	95
49	97
50	99
51	46
52	40
53	105
54	60
55	90
56	36
57	29
58	66
59	117
60	54
61	121
62	69
63	32
64	127
65	84
66	58

n	a(n)
0	0
1	1
2	3
3	2
4	7
5	9
6	6
7	4
8	15
9	5
10	12
11	21
12	10
13	25
14	27
15	8
16	31
17	33
18	35
19	37
20	39
21	11
22	24
23	45
24	22
25	13
26	30
27	14
28	42
29	57
30	26
31	16
32	63
33	17
34	67
35	18
36	56
37	19
38	75
39	20
40	52
41	81
42	28
43	85
44	87
45	23
46	51
47	93
48	95
49	97
50	99
51	46
52	40
53	105
54	60
55	90
56	36
57	29
58	66
59	117
60	54
61	121
62	69
63	32
64	127
65	84
66	58