A379676 - cp's OEIS frontend

A379676 For n >= 0, a(n) is the least k >= 2 such that (n + 1)(2k + n) / 2 is a triangular number (A000217).

n	a(n)
0	3
1	7
2	4
3	15
4	7
5	5
6	10
7	31
8	13
9	6
10	16
11	12
12	19
13	10
14	7
15	63
16	25
17	11
18	28
19	22
20	8
21	15
22	34
23	21
24	37
25	16
26	40
27	9
28	43
29	20
30	46
31	127
32	14
33	21
34	18
35	10
36	55
37	25
38	15
39	19
40	61
41	26
42	64
43	45
44	11
45	30
46	70
47	44
48	73
49	31
50	21
51	55
52	79
53	35
54	12
55	70
56	22
57	36
58	88
59	18
60	91
61	40
62	34
63	255
64	31
65	13
66	100
67	19
68	28
69	24
70	106
71	92
72	109
73	46
74	29
75	78
76	25
77	14
78	118
79	91
80	121
81	51
82	124
83	63
84	42
85	55
86	35
87	39
88	133
89	43
90	15

[3, 7, 4, 15, 7, 5, 10, 31, 13, 6, 16, 12, 19, 10, 7, 63, 25, 11, 28, 22, 8, 15, 34, 21, 37, 16, 40, 9, 43, 20, 46, 127, 14, 21, 18, 10, 55, 25, 15, 19, 61, 26, 64, 45, 11, 30, 70, 44, 73, 31, 21, 55, 79, 35, 12, 70, 22, 36, 88, 18, 91, 40, 34, 255, 31, 13, 100, 19, 28, 24, 106, 92, 109, 46, 29, 78, 25, 14, 118, 91, 121, 51, 124, 63, 42, 55, 35, 39, 133, 43, 15]

cp's OEIS Frontend

A379676 For n >= 0, a(n) is the least k >= 2 such that (n + 1)(2k + n) / 2 is a triangular number (A000217).

Table of values

List of values

n	a(n)
0	3
1	7
2	4
3	15
4	7
5	5
6	10
7	31
8	13
9	6
10	16
11	12
12	19
13	10
14	7
15	63
16	25
17	11
18	28
19	22
20	8
21	15
22	34
23	21
24	37
25	16
26	40
27	9
28	43
29	20
30	46
31	127
32	14
33	21
34	18
35	10
36	55
37	25
38	15
39	19
40	61
41	26
42	64
43	45
44	11
45	30
46	70
47	44
48	73
49	31
50	21
51	55
52	79
53	35
54	12
55	70
56	22
57	36
58	88
59	18
60	91
61	40
62	34
63	255
64	31
65	13
66	100
67	19
68	28
69	24
70	106
71	92
72	109
73	46
74	29
75	78
76	25
77	14
78	118
79	91
80	121
81	51
82	124
83	63
84	42
85	55
86	35
87	39
88	133
89	43
90	15

n	a(n)
0	3
1	7
2	4
3	15
4	7
5	5
6	10
7	31
8	13
9	6
10	16
11	12
12	19
13	10
14	7
15	63
16	25
17	11
18	28
19	22
20	8
21	15
22	34
23	21
24	37
25	16
26	40
27	9
28	43
29	20
30	46
31	127
32	14
33	21
34	18
35	10
36	55
37	25
38	15
39	19
40	61
41	26
42	64
43	45
44	11
45	30
46	70
47	44
48	73
49	31
50	21
51	55
52	79
53	35
54	12
55	70
56	22
57	36
58	88
59	18
60	91
61	40
62	34
63	255
64	31
65	13
66	100
67	19
68	28
69	24
70	106
71	92
72	109
73	46
74	29
75	78
76	25
77	14
78	118
79	91
80	121
81	51
82	124
83	63
84	42
85	55
86	35
87	39
88	133
89	43
90	15

cp's OEIS Frontend

A379676 For n >= 0, a(n) is the least k >= 2 such that (n + 1)*(2*k + n) / 2 is a triangular number (A000217).

Table of values

List of values

A379676 For n >= 0, a(n) is the least k >= 2 such that (n + 1)(2k + n) / 2 is a triangular number (A000217).

n	a(n)
0	3
1	7
2	4
3	15
4	7
5	5
6	10
7	31
8	13
9	6
10	16
11	12
12	19
13	10
14	7
15	63
16	25
17	11
18	28
19	22
20	8
21	15
22	34
23	21
24	37
25	16
26	40
27	9
28	43
29	20
30	46
31	127
32	14
33	21
34	18
35	10
36	55
37	25
38	15
39	19
40	61
41	26
42	64
43	45
44	11
45	30
46	70
47	44
48	73
49	31
50	21
51	55
52	79
53	35
54	12
55	70
56	22
57	36
58	88
59	18
60	91
61	40
62	34
63	255
64	31
65	13
66	100
67	19
68	28
69	24
70	106
71	92
72	109
73	46
74	29
75	78
76	25
77	14
78	118
79	91
80	121
81	51
82	124
83	63
84	42
85	55
86	35
87	39
88	133
89	43
90	15