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A131608 as a simple table

na(n)
01
11
23
37
47
51
69
79
87
93
103
119
12-1
13-1
14-3
15-7
16-7
17-1
18-9
19-9
20-7
21-3
22-3
23-9
241
251
263
277
287
291
309
319
327
333
343
359
36-1
37-1
38-3
39-7
40-7
41-1
42-9
43-9
44-7
45-3
46-3
47-9
481
491
503
517
527
531
549
559
567
573
583
599
60-1
61-1
62-3
63-7
64-7
65-1
66-9
67-9
68-7
69-3
70-3
71-9
721
731
743
757
767
771
789
799
807
813
823
839
84-1
85-1
86-3
87-7
88-7
89-1
90-9
91-9
92-7
93-3
94-3
95-9

[1,1,3,7,7,1,9,9,7,3,3,9,-1,-1,-3,-7,-7,-1,-9,-9,
 -7,-3,-3,-9,1,1,3,7,7,1,9,9,7,3,3,9,-1,-1,-3,-7,
 -7,-1,-9,-9,-7,-3,-3,-9,1,1,3,7,7,1,9,9,7,3,3,9,
 -1,-1,-3,-7,-7,-1,-9,-9,-7,-3,-3,-9,1,1,3,7,7,1,9,
 9,7,3,3,9,-1,-1,-3,-7,-7,-1,-9,-9,-7,-3,-3,-9]