A189683 - OEIS

A189683 as a simple table

n	a(n)
1	691
2	12
3	3617
4	16
5	43867
6	18
7	283
8	20
9	617
10	20
11	131
12	22
13	593
14	22
15	103
16	24
17	2294797
18	24
19	657931
20	26
21	9349
22	28
23	362903
24	28
25	1721
26	30
27	1001259881
28	30
29	37
30	32
31	683
32	32
33	305065927
34	32
35	151628697551
36	34
37	26315271553053477373
38	36
39	154210205991661
40	38
41	137616929
42	40

[691,12,3617,16,43867,18,283,20,617,20,131,22,593, 22,103,24,2294797,24,657931,26,9349,28,362903,28, 1721,30,1001259881,30,37,32,683,32,305065927,32, 151628697551,34,26315271553053477373,36, 154210205991661,38,137616929,40]