login

A168423 as a simple table

na(n)
01
1-1
21
31
4-1
51
6-1
71
81
91
101
11-1
121
137
141
15-1
161
171
1821
1921
201
211
22-1
231
2451
25161
2651
271
28-1
291
301
31113
32813
33813
34113
351
361
37-1
381
39239
403361
417631
423361
43239
441
45-1
461
471
48493
4912421
5053833
5153833
5212421
53493
541
551
56-1
571
581003
5942865
60320107
61607009
62320107
6342865

[1,-1,1,1,-1,1,-1,1,1,1,1,-1,1,7,1,-1,1,1,21,21,1,
 1,-1,1,51,161,51,1,-1,1,1,113,813,813,113,1,1,-1,
 1,239,3361,7631,3361,239,1,-1,1,1,493,12421,53833,
 53833,12421,493,1,1,-1,1,1003,42865,320107,607009,
 320107,42865]