A379697 - cp's OEIS frontend

A379697 For n >= 3, a(n) is the least k >= 0 such that (k + 1)(2n + k) / 2 is a triangular number (A000217).

n	a(n)
3	0
4	2
5	5
6	0
7	1
8	20
9	4
10	0
11	2
12	6
13	8
14	2
15	0
16	10
17	119
18	3
19	4
20	20
21	0
22	1
23	5
24	14
25	2
26	5
27	1
28	0
29	32
30	6
31	7
32	464
33	20
34	2
35	8
36	0
37	24
38	8
39	2
40	4
41	65
42	9
43	10
44	47
45	0
46	3
47	11
48	30
49	17
50	2
51	3
52	1
53	59
54	12
55	0
56	2
57	21
58	4
59	14
60	38
61	40
62	14
63	4
64	42
65	101
66	0
67	16
68	74
69	2
70	5
71	17
72	46
73	48
74	17
75	5
76	1
77	11
78	0
79	19
80	125
81	10
82	6
83	20
84	54
85	1
86	20
87	6
88	44
89	272
90	21
91	0

[0, 2, 5, 0, 1, 20, 4, 0, 2, 6, 8, 2, 0, 10, 119, 3, 4, 20, 0, 1, 5, 14, 2, 5, 1, 0, 32, 6, 7, 464, 20, 2, 8, 0, 24, 8, 2, 4, 65, 9, 10, 47, 0, 3, 11, 30, 17, 2, 3, 1, 59, 12, 0, 2, 21, 4, 14, 38, 40, 14, 4, 42, 101, 0, 16, 74, 2, 5, 17, 46, 48, 17, 5, 1, 11, 0, 19, 125, 10, 6, 20, 54, 1, 20, 6, 44, 272, 21, 0]

cp's OEIS Frontend

A379697 For n >= 3, a(n) is the least k >= 0 such that (k + 1)(2n + k) / 2 is a triangular number (A000217).

Table of values

List of values

n	a(n)
3	0
4	2
5	5
6	0
7	1
8	20
9	4
10	0
11	2
12	6
13	8
14	2
15	0
16	10
17	119
18	3
19	4
20	20
21	0
22	1
23	5
24	14
25	2
26	5
27	1
28	0
29	32
30	6
31	7
32	464
33	20
34	2
35	8
36	0
37	24
38	8
39	2
40	4
41	65
42	9
43	10
44	47
45	0
46	3
47	11
48	30
49	17
50	2
51	3
52	1
53	59
54	12
55	0
56	2
57	21
58	4
59	14
60	38
61	40
62	14
63	4
64	42
65	101
66	0
67	16
68	74
69	2
70	5
71	17
72	46
73	48
74	17
75	5
76	1
77	11
78	0
79	19
80	125
81	10
82	6
83	20
84	54
85	1
86	20
87	6
88	44
89	272
90	21
91	0

n	a(n)
3	0
4	2
5	5
6	0
7	1
8	20
9	4
10	0
11	2
12	6
13	8
14	2
15	0
16	10
17	119
18	3
19	4
20	20
21	0
22	1
23	5
24	14
25	2
26	5
27	1
28	0
29	32
30	6
31	7
32	464
33	20
34	2
35	8
36	0
37	24
38	8
39	2
40	4
41	65
42	9
43	10
44	47
45	0
46	3
47	11
48	30
49	17
50	2
51	3
52	1
53	59
54	12
55	0
56	2
57	21
58	4
59	14
60	38
61	40
62	14
63	4
64	42
65	101
66	0
67	16
68	74
69	2
70	5
71	17
72	46
73	48
74	17
75	5
76	1
77	11
78	0
79	19
80	125
81	10
82	6
83	20
84	54
85	1
86	20
87	6
88	44
89	272
90	21
91	0

cp's OEIS Frontend

A379697 For n >= 3, a(n) is the least k >= 0 such that (k + 1)*(2*n + k) / 2 is a triangular number (A000217).

Table of values

List of values

A379697 For n >= 3, a(n) is the least k >= 0 such that (k + 1)(2n + k) / 2 is a triangular number (A000217).

n	a(n)
3	0
4	2
5	5
6	0
7	1
8	20
9	4
10	0
11	2
12	6
13	8
14	2
15	0
16	10
17	119
18	3
19	4
20	20
21	0
22	1
23	5
24	14
25	2
26	5
27	1
28	0
29	32
30	6
31	7
32	464
33	20
34	2
35	8
36	0
37	24
38	8
39	2
40	4
41	65
42	9
43	10
44	47
45	0
46	3
47	11
48	30
49	17
50	2
51	3
52	1
53	59
54	12
55	0
56	2
57	21
58	4
59	14
60	38
61	40
62	14
63	4
64	42
65	101
66	0
67	16
68	74
69	2
70	5
71	17
72	46
73	48
74	17
75	5
76	1
77	11
78	0
79	19
80	125
81	10
82	6
83	20
84	54
85	1
86	20
87	6
88	44
89	272
90	21
91	0