A358444 - cp's OEIS frontend

A358444 a(1) = 1, a(2) = 2; for n > 2, a(n) = smallest positive number which has not appeared that has a common factor with a(n-2)^2 + a(n-1)^2.

n	a(n)
1	1
2	2
3	5
4	29
5	4
6	857
7	10
8	734549
9	539562233501
10	6
11	12433
12	15
13	8
14	17
15	353
16	12
17	124753
18	13
19	14
20	20
21	16
22	18
23	22
24	24
25	25
26	1201
27	26
28	41
29	2357
30	28
31	5556233
32	37
33	30
34	2269
35	39
36	32
37	35
38	52
39	3929
40	40
41	15438641
42	82
43	45
44	65
45	34
46	5381
47	78
48	50
49	36
50	38
51	42
52	44
53	46
54	48
55	51
56	3
57	9
58	21
59	27
60	33
61	54
62	55
63	91

[1, 2, 5, 29, 4, 857, 10, 734549, 539562233501, 6, 12433, 15, 8, 17, 353, 12, 124753, 13, 14, 20, 16, 18, 22, 24, 25, 1201, 26, 41, 2357, 28, 5556233, 37, 30, 2269, 39, 32, 35, 52, 3929, 40, 15438641, 82, 45, 65, 34, 5381, 78, 50, 36, 38, 42, 44, 46, 48, 51, 3, 9, 21, 27, 33, 54, 55, 91]

cp's OEIS Frontend

A358444 a(1) = 1, a(2) = 2; for n > 2, a(n) = smallest positive number which has not appeared that has a common factor with a(n-2)^2 + a(n-1)^2.

Table of values

List of values