A253881 - cp's OEIS frontend

A253881 Positive integers N such that rational Diophantine triple {-1/N, N, (N^2-1)/N} can be extended to a quadruple.

n	a(n)
1	9
2	10
3	11
4	13
5	14
6	15
7	16
8	17
9	18
10	19
11	21
12	22
13	23
14	24
15	25
16	29
17	31
18	33
19	34
20	37
21	40
22	41
23	43
24	45
25	46
26	48
27	49
28	50
29	51
30	52
31	54
32	55
33	56
34	57
35	60
36	61
37	62
38	65
39	68
40	69
41	70
42	71
43	72
44	73
45	74
46	75
47	77
48	78
49	79
50	80
51	81
52	83
53	84
54	85
55	86
56	88
57	91
58	93
59	95
60	96
61	97
62	99
63	103
64	105
65	106
66	111
67	113
68	114
69	115
70	117
71	119

[9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 29, 31, 33, 34, 37, 40, 41, 43, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 60, 61, 62, 65, 68, 69, 70, 71, 72, 73, 74, 75, 77, 78, 79, 80, 81, 83, 84, 85, 86, 88, 91, 93, 95, 96, 97, 99, 103, 105, 106, 111, 113, 114, 115, 117, 119]

cp's OEIS Frontend

A253881 Positive integers N such that rational Diophantine triple {-1/N, N, (N^2-1)/N} can be extended to a quadruple.

Table of values

List of values

n	a(n)
1	9
2	10
3	11
4	13
5	14
6	15
7	16
8	17
9	18
10	19
11	21
12	22
13	23
14	24
15	25
16	29
17	31
18	33
19	34
20	37
21	40
22	41
23	43
24	45
25	46
26	48
27	49
28	50
29	51
30	52
31	54
32	55
33	56
34	57
35	60
36	61
37	62
38	65
39	68
40	69
41	70
42	71
43	72
44	73
45	74
46	75
47	77
48	78
49	79
50	80
51	81
52	83
53	84
54	85
55	86
56	88
57	91
58	93
59	95
60	96
61	97
62	99
63	103
64	105
65	106
66	111
67	113
68	114
69	115
70	117
71	119

n	a(n)
1	9
2	10
3	11
4	13
5	14
6	15
7	16
8	17
9	18
10	19
11	21
12	22
13	23
14	24
15	25
16	29
17	31
18	33
19	34
20	37
21	40
22	41
23	43
24	45
25	46
26	48
27	49
28	50
29	51
30	52
31	54
32	55
33	56
34	57
35	60
36	61
37	62
38	65
39	68
40	69
41	70
42	71
43	72
44	73
45	74
46	75
47	77
48	78
49	79
50	80
51	81
52	83
53	84
54	85
55	86
56	88
57	91
58	93
59	95
60	96
61	97
62	99
63	103
64	105
65	106
66	111
67	113
68	114
69	115
70	117
71	119

n	a(n)
1	9
2	10
3	11
4	13
5	14
6	15
7	16
8	17
9	18
10	19
11	21
12	22
13	23
14	24
15	25
16	29
17	31
18	33
19	34
20	37
21	40
22	41
23	43
24	45
25	46
26	48
27	49
28	50
29	51
30	52
31	54
32	55
33	56
34	57
35	60
36	61
37	62
38	65
39	68
40	69
41	70
42	71
43	72
44	73
45	74
46	75
47	77
48	78
49	79
50	80
51	81
52	83
53	84
54	85
55	86
56	88
57	91
58	93
59	95
60	96
61	97
62	99
63	103
64	105
65	106
66	111
67	113
68	114
69	115
70	117
71	119