A034175 - cp's OEIS frontend

A034175 a(n) is minimal such that a(n)+a(n-1) is a square and a(n) is not in {a(0), ..., a(n-1)}.

n	a(n)
0	0
1	1
2	3
3	6
4	10
5	15
6	21
7	4
8	5
9	11
10	14
11	2
12	7
13	9
14	16
15	20
16	29
17	35
18	46
19	18
20	31
21	33
22	48
23	52
24	12
25	13
26	23
27	26
28	38
29	43
30	57
31	24
32	25
33	39
34	42
35	22
36	27
37	37
38	44
39	56
40	8
41	17
42	19
43	30
44	34
45	47
46	53
47	28
48	36
49	45
50	55
51	66
52	78
53	91
54	105
55	64
56	80
57	41
58	40
59	60
60	61
61	83
62	86
63	58
64	63
65	81
66	88
67	108
68	117
69	79
70	65

[0, 1, 3, 6, 10, 15, 21, 4, 5, 11, 14, 2, 7, 9, 16, 20, 29, 35, 46, 18, 31, 33, 48, 52, 12, 13, 23, 26, 38, 43, 57, 24, 25, 39, 42, 22, 27, 37, 44, 56, 8, 17, 19, 30, 34, 47, 53, 28, 36, 45, 55, 66, 78, 91, 105, 64, 80, 41, 40, 60, 61, 83, 86, 58, 63, 81, 88, 108, 117, 79, 65]

cp's OEIS Frontend

A034175 a(n) is minimal such that a(n)+a(n-1) is a square and a(n) is not in {a(0), ..., a(n-1)}.

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	6
4	10
5	15
6	21
7	4
8	5
9	11
10	14
11	2
12	7
13	9
14	16
15	20
16	29
17	35
18	46
19	18
20	31
21	33
22	48
23	52
24	12
25	13
26	23
27	26
28	38
29	43
30	57
31	24
32	25
33	39
34	42
35	22
36	27
37	37
38	44
39	56
40	8
41	17
42	19
43	30
44	34
45	47
46	53
47	28
48	36
49	45
50	55
51	66
52	78
53	91
54	105
55	64
56	80
57	41
58	40
59	60
60	61
61	83
62	86
63	58
64	63
65	81
66	88
67	108
68	117
69	79
70	65

n	a(n)
0	0
1	1
2	3
3	6
4	10
5	15
6	21
7	4
8	5
9	11
10	14
11	2
12	7
13	9
14	16
15	20
16	29
17	35
18	46
19	18
20	31
21	33
22	48
23	52
24	12
25	13
26	23
27	26
28	38
29	43
30	57
31	24
32	25
33	39
34	42
35	22
36	27
37	37
38	44
39	56
40	8
41	17
42	19
43	30
44	34
45	47
46	53
47	28
48	36
49	45
50	55
51	66
52	78
53	91
54	105
55	64
56	80
57	41
58	40
59	60
60	61
61	83
62	86
63	58
64	63
65	81
66	88
67	108
68	117
69	79
70	65

n	a(n)
0	0
1	1
2	3
3	6
4	10
5	15
6	21
7	4
8	5
9	11
10	14
11	2
12	7
13	9
14	16
15	20
16	29
17	35
18	46
19	18
20	31
21	33
22	48
23	52
24	12
25	13
26	23
27	26
28	38
29	43
30	57
31	24
32	25
33	39
34	42
35	22
36	27
37	37
38	44
39	56
40	8
41	17
42	19
43	30
44	34
45	47
46	53
47	28
48	36
49	45
50	55
51	66
52	78
53	91
54	105
55	64
56	80
57	41
58	40
59	60
60	61
61	83
62	86
63	58
64	63
65	81
66	88
67	108
68	117
69	79
70	65