A280997 - OEIS

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A280997 as a simple table

n	a(n)
1	13
2	37
3	41
4	67
5	97
6	131
7	193
8	577
9	1033
10	1153
11	2053
12	4129
13	8209
14	18433
15	32771
16	32801
17	32833
18	65539
19	133121
20	525313
21	557057
22	1049089
23	4194433
24	167772161
25	268435459

[13,37,41,67,97,131,193,577,1033,1153,2053,4129, 8209,18433,32771,32801,32833,65539,133121,525313, 557057,1049089,4194433,167772161,268435459]