A139426 - OEIS

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A139426 as a simple table

n	a(n)
1	1
2	5
3	1
4	5
5	11
6	11
7	17
8	19
9	23
10	97
11	127
12	145
13	167
14	269
15	767
16	479
17	3307
18	1453
19	18007
20	2357
21	599
22	17669
23	5527
24	3191
25	3251
26	70249
27	147773
28	39637

[1,5,1,5,11,11,17,19,23,97,127,145,167,269,767, 479,3307,1453,18007,2357,599,17669,5527,3191,3251, 70249,147773,39637]