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A209766 as a simple table

na(n)
11
21
33
41
53
67
71
83
913
1017
111
123
1313
1443
1541
161
173
1813
1955
20133
2199
221
233
2413
2555
26209
27391
28239
291
303
3113
3255
33233
34739
351113
36577
371
383
3913
4055
41233
42939
432469
443095
451393
461
473
4813
4955
50233
51987
523589
537903
548457
553363
561
573
5813
5955
60233
61987
624085

[1,1,3,1,3,7,1,3,13,17,1,3,13,43,41,1,3,13,55,133,
 99,1,3,13,55,209,391,239,1,3,13,55,233,739,1113,
 577,1,3,13,55,233,939,2469,3095,1393,1,3,13,55,
 233,987,3589,7903,8457,3363,1,3,13,55,233,987,
 4085]