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A131303 as a simple table

na(n)
11
23
31
45
55
61
77
83
93
101
119
1215
135
143
151
1611
1713
187
195
203
211
2213
2311
2411
259
265
273
28115
297
309
317
329
335
343
351
3617
379
3813
3911
4011
4111
425
433
441
4519
4643
4715
4813
497
507
517
525
533
541

[1,3,1,5,5,1,7,3,3,1,9,15,5,3,1,11,13,7,5,3,1,13,
 11,11,9,5,3,115,7,9,7,9,5,3,1,17,9,13,11,11,11,5,
 3,1,19,43,15,13,7,7,7,5,3,1]