A120868 - cp's OEIS frontend

A120868 a(n) is the number k for which there exists a unique pair (j,k) of positive integers such that (j + k + 1)^2 - 4k = 5n^2.

n	a(n)
1	1
2	4
3	1
4	5
5	11
6	4
7	11
8	1
9	9
10	19
11	5
12	16
13	29
14	11
15	25
16	4
17	19
18	36
19	11
20	29
21	1
22	20
23	41
24	9
25	31
26	55
27	19
28	44
29	5
30	31
31	59
32	16
33	45
34	76
35	29
36	61
37	11
38	44
39	79
40	25
41	61
42	4
43	41
44	80
45	19
46	59
47	101
48	36
49	79
50	11
51	55
52	101
53	29
54	76
55	1
56	49
57	99
58	20
59	71
60	124
61	41
62	95
63	9
64	64
65	121
66	31
67	89
68	149
69	55
70	116
71	19
72	81
73	145

[1, 4, 1, 5, 11, 4, 11, 1, 9, 19, 5, 16, 29, 11, 25, 4, 19, 36, 11, 29, 1, 20, 41, 9, 31, 55, 19, 44, 5, 31, 59, 16, 45, 76, 29, 61, 11, 44, 79, 25, 61, 4, 41, 80, 19, 59, 101, 36, 79, 11, 55, 101, 29, 76, 1, 49, 99, 20, 71, 124, 41, 95, 9, 64, 121, 31, 89, 149, 55, 116, 19, 81, 145]

cp's OEIS Frontend

A120868 a(n) is the number k for which there exists a unique pair (j,k) of positive integers such that (j + k + 1)^2 - 4k = 5n^2.

Table of values

List of values

n	a(n)
1	1
2	4
3	1
4	5
5	11
6	4
7	11
8	1
9	9
10	19
11	5
12	16
13	29
14	11
15	25
16	4
17	19
18	36
19	11
20	29
21	1
22	20
23	41
24	9
25	31
26	55
27	19
28	44
29	5
30	31
31	59
32	16
33	45
34	76
35	29
36	61
37	11
38	44
39	79
40	25
41	61
42	4
43	41
44	80
45	19
46	59
47	101
48	36
49	79
50	11
51	55
52	101
53	29
54	76
55	1
56	49
57	99
58	20
59	71
60	124
61	41
62	95
63	9
64	64
65	121
66	31
67	89
68	149
69	55
70	116
71	19
72	81
73	145

n	a(n)
1	1
2	4
3	1
4	5
5	11
6	4
7	11
8	1
9	9
10	19
11	5
12	16
13	29
14	11
15	25
16	4
17	19
18	36
19	11
20	29
21	1
22	20
23	41
24	9
25	31
26	55
27	19
28	44
29	5
30	31
31	59
32	16
33	45
34	76
35	29
36	61
37	11
38	44
39	79
40	25
41	61
42	4
43	41
44	80
45	19
46	59
47	101
48	36
49	79
50	11
51	55
52	101
53	29
54	76
55	1
56	49
57	99
58	20
59	71
60	124
61	41
62	95
63	9
64	64
65	121
66	31
67	89
68	149
69	55
70	116
71	19
72	81
73	145

cp's OEIS Frontend

A120868 a(n) is the number k for which there exists a unique pair (j,k) of positive integers such that (j + k + 1)^2 - 4*k = 5*n^2.

Table of values

List of values

A120868 a(n) is the number k for which there exists a unique pair (j,k) of positive integers such that (j + k + 1)^2 - 4k = 5n^2.

n	a(n)
1	1
2	4
3	1
4	5
5	11
6	4
7	11
8	1
9	9
10	19
11	5
12	16
13	29
14	11
15	25
16	4
17	19
18	36
19	11
20	29
21	1
22	20
23	41
24	9
25	31
26	55
27	19
28	44
29	5
30	31
31	59
32	16
33	45
34	76
35	29
36	61
37	11
38	44
39	79
40	25
41	61
42	4
43	41
44	80
45	19
46	59
47	101
48	36
49	79
50	11
51	55
52	101
53	29
54	76
55	1
56	49
57	99
58	20
59	71
60	124
61	41
62	95
63	9
64	64
65	121
66	31
67	89
68	149
69	55
70	116
71	19
72	81
73	145