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A240504 as a simple table

na(n)
21
33
43
57
61
73
811
911
101
113
1211
1323
1451
1543
1643
1787
1823
1947
2015
2195
22215
23431
2447
2547
26295
27423
28391
29783
30143
31287
321311
331887
34847
35719
36719
371439
383471
392511
40975
411951
427583
4315167
4414655
4512607
464383
478767
48575
49575
5016959
5125407
5224895
5349791
54639
5510879

[1,3,3,7,1,3,11,11,1,3,11,23,51,43,43,87,23,47,15,
 95,215,431,47,47,295,423,391,783,143,287,1311,
 1887,847,719,719,1439,3471,2511,975,1951,7583,
 15167,14655,12607,4383,8767,575,575,16959,25407,
 24895,49791,639,10879]