A256271 - cp's OEIS frontend

A256271 a(1) = 1; for n > 1, a(n) is the smallest number not already in the sequence such that a(n)^2 + a(n-1)^2 is squarefree.

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

[1, 2, 3, 5, 4, 7, 6, 11, 8, 9, 10, 13, 12, 17, 14, 15, 16, 19, 18, 23, 20, 27, 22, 25, 21, 26, 29, 24, 31, 28, 33, 32, 35, 34, 39, 38, 37, 30, 41, 36, 43, 40, 47, 42, 53, 44, 45, 46, 49, 48, 59, 50, 51, 52, 55, 54, 61, 56, 57, 58, 63, 62, 65, 64, 67, 60, 71, 66, 73, 68, 69, 70, 79, 74, 75, 76, 77, 72, 83, 78, 85]

cp's OEIS Frontend

A256271 a(1) = 1; for n > 1, a(n) is the smallest number not already in the sequence such that a(n)^2 + a(n-1)^2 is squarefree.

Table of values

List of values

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

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

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