A154708 - cp's OEIS frontend

A154708 Numbers a such that b and c exist with b <= a < c and a*(a+1) + b^2 = c^2.

n	a(n)
1	3
2	4
3	7
4	8
5	11
6	12
7	15
8	16
9	19
10	20
11	23
12	24
13	27
14	28
15	31
16	32
17	35
18	36
19	39
20	40
21	43
22	44
23	47
24	48
25	51
26	52
27	55
28	56
29	59
30	60
31	63
32	64
33	67
34	68
35	71
36	72
37	75
38	76
39	79
40	80
41	83
42	84
43	87
44	88
45	91
46	92
47	95
48	96
49	99
50	100
51	103
52	104
53	107
54	108
55	111
56	112
57	115
58	116
59	119
60	120
61	123
62	124
63	127
64	128
65	131
66	132
67	135
68	136
69	139
70	140

[3, 4, 7, 8, 11, 12, 15, 16, 19, 20, 23, 24, 27, 28, 31, 32, 35, 36, 39, 40, 43, 44, 47, 48, 51, 52, 55, 56, 59, 60, 63, 64, 67, 68, 71, 72, 75, 76, 79, 80, 83, 84, 87, 88, 91, 92, 95, 96, 99, 100, 103, 104, 107, 108, 111, 112, 115, 116, 119, 120, 123, 124, 127, 128, 131, 132, 135, 136, 139, 140]

cp's OEIS Frontend

A154708 Numbers a such that b and c exist with b <= a < c and a*(a+1) + b^2 = c^2.

Table of values

List of values

n	a(n)
1	3
2	4
3	7
4	8
5	11
6	12
7	15
8	16
9	19
10	20
11	23
12	24
13	27
14	28
15	31
16	32
17	35
18	36
19	39
20	40
21	43
22	44
23	47
24	48
25	51
26	52
27	55
28	56
29	59
30	60
31	63
32	64
33	67
34	68
35	71
36	72
37	75
38	76
39	79
40	80
41	83
42	84
43	87
44	88
45	91
46	92
47	95
48	96
49	99
50	100
51	103
52	104
53	107
54	108
55	111
56	112
57	115
58	116
59	119
60	120
61	123
62	124
63	127
64	128
65	131
66	132
67	135
68	136
69	139
70	140

n	a(n)
1	3
2	4
3	7
4	8
5	11
6	12
7	15
8	16
9	19
10	20
11	23
12	24
13	27
14	28
15	31
16	32
17	35
18	36
19	39
20	40
21	43
22	44
23	47
24	48
25	51
26	52
27	55
28	56
29	59
30	60
31	63
32	64
33	67
34	68
35	71
36	72
37	75
38	76
39	79
40	80
41	83
42	84
43	87
44	88
45	91
46	92
47	95
48	96
49	99
50	100
51	103
52	104
53	107
54	108
55	111
56	112
57	115
58	116
59	119
60	120
61	123
62	124
63	127
64	128
65	131
66	132
67	135
68	136
69	139
70	140

n	a(n)
1	3
2	4
3	7
4	8
5	11
6	12
7	15
8	16
9	19
10	20
11	23
12	24
13	27
14	28
15	31
16	32
17	35
18	36
19	39
20	40
21	43
22	44
23	47
24	48
25	51
26	52
27	55
28	56
29	59
30	60
31	63
32	64
33	67
34	68
35	71
36	72
37	75
38	76
39	79
40	80
41	83
42	84
43	87
44	88
45	91
46	92
47	95
48	96
49	99
50	100
51	103
52	104
53	107
54	108
55	111
56	112
57	115
58	116
59	119
60	120
61	123
62	124
63	127
64	128
65	131
66	132
67	135
68	136
69	139
70	140