A089619 - cp's OEIS frontend

A089619 a(n) = greatest prime factor of n^2 + (n+1)^2 for n >= 1.

n	a(n)
1	5
2	13
3	5
4	41
5	61
6	17
7	113
8	29
9	181
10	17
11	53
12	313
13	73
14	421
15	37
16	109
17	613
18	137
19	761
20	29
21	37
22	1013
23	17
24	1201
25	1301
26	281
27	89
28	13
29	1741
30	1861
31	397
32	2113
33	449
34	2381
35	2521
36	41
37	97
38	593
39	3121
40	193
41	53
42	3613
43	757
44	233
45	101
46	173
47	4513
48	941
49	29
50	5101
51	1061
52	149
53	229
54	457
55	101

[5, 13, 5, 41, 61, 17, 113, 29, 181, 17, 53, 313, 73, 421, 37, 109, 613, 137, 761, 29, 37, 1013, 17, 1201, 1301, 281, 89, 13, 1741, 1861, 397, 2113, 449, 2381, 2521, 41, 97, 593, 3121, 193, 53, 3613, 757, 233, 101, 173, 4513, 941, 29, 5101, 1061, 149, 229, 457, 101]

cp's OEIS Frontend

A089619 a(n) = greatest prime factor of n^2 + (n+1)^2 for n >= 1.

Table of values

List of values