A001989 - OEIS

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A001989 as a simple table

n	a(n)
1	1
2	1
3	5
4	7
5	7
6	7
7	9
8	53
9	73
10	83
11	83
12	83
13	157
14	185
15	185
16	185
17	185
18	1927
19	2295
20	2273
21	5313
22	5313
23	7173
24	9529
25	18545
26	18545
27	18545
28	18545
29	22635
30	22635
31	66011
32	121725
33	344909
34	344909

[1,1,5,7,7,7,9,53,73,83,83,83,157,185,185,185,185, 1927,2295,2273,5313,5313,7173,9529,18545,18545, 18545,18545,22635,22635,66011,121725,344909, 344909]