A219586 - cp's OEIS frontend

A219586 Greatest prime factor of Product_{x=1..n} (x^2 + 1).

n	a(n)
1	2
2	5
3	5
4	17
5	17
6	37
7	37
8	37
9	41
10	101
11	101
12	101
13	101
14	197
15	197
16	257
17	257
18	257
19	257
20	401
21	401
22	401
23	401
24	577
25	577
26	677
27	677
28	677
29	677
30	677
31	677
32	677
33	677
34	677
35	677
36	1297
37	1297
38	1297
39	1297
40	1601
41	1601
42	1601
43	1601
44	1601
45	1601
46	1601
47	1601
48	1601
49	1601
50	1601
51	1601

[2, 5, 5, 17, 17, 37, 37, 37, 41, 101, 101, 101, 101, 197, 197, 257, 257, 257, 257, 401, 401, 401, 401, 577, 577, 677, 677, 677, 677, 677, 677, 677, 677, 677, 677, 1297, 1297, 1297, 1297, 1601, 1601, 1601, 1601, 1601, 1601, 1601, 1601, 1601, 1601, 1601, 1601]

cp's OEIS Frontend

A219586 Greatest prime factor of Product_{x=1..n} (x^2 + 1).

Table of values

List of values