A367005 - cp's OEIS frontend

A367005 a(n) is the largest prime factor of n*2^n+1 for n>0, and a(0)=1.

n	a(n)
0	1
1	3
2	3
3	5
4	13
5	23
6	11
7	23
8	683
9	419
10	19
11	1733
12	199
13	11833
14	487
15	997
16	61681
17	4691
18	211
19	5279
20	7541
21	1914791
22	7177
23	607
24	5233
25	6689
26	2373919
27	336823
28	8937209
29	6051013
30	409
31	11681
32	25781083
33	6031230671
34	18803
35	32502455213
36	934861
37	339016085231
38	55586743

[1, 3, 3, 5, 13, 23, 11, 23, 683, 419, 19, 1733, 199, 11833, 487, 997, 61681, 4691, 211, 5279, 7541, 1914791, 7177, 607, 5233, 6689, 2373919, 336823, 8937209, 6051013, 409, 11681, 25781083, 6031230671, 18803, 32502455213, 934861, 339016085231, 55586743]

cp's OEIS Frontend

A367005 a(n) is the largest prime factor of n*2^n+1 for n>0, and a(0)=1.

Table of values

List of values