A367003 - cp's OEIS frontend

A367003 a(n) is the largest prime factor of n*2^n-1.

n	a(n)
1	1
2	7
3	23
4	7
5	53
6	383
7	179
8	89
9	271
10	3413
11	2503
12	2137
13	59
14	367
15	1433
16	41
17	15803
18	59729
19	26423
20	11161
21	1559
22	12611
23	9187523
24	127867
25	119837257
26	11527
27	2360833
28	43969
29	2339
30	32212254719
31	257503
32	616318177
33	260587
34	127873
35	682902239
36	44939
37	69660839431
38	1185617

[1, 7, 23, 7, 53, 383, 179, 89, 271, 3413, 2503, 2137, 59, 367, 1433, 41, 15803, 59729, 26423, 11161, 1559, 12611, 9187523, 127867, 119837257, 11527, 2360833, 43969, 2339, 32212254719, 257503, 616318177, 260587, 127873, 682902239, 44939, 69660839431, 1185617]

cp's OEIS Frontend

A367003 a(n) is the largest prime factor of n*2^n-1.

Table of values

List of values