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A006540 as a simple table

na(n)
01
13
25
37
47
513
619
723
831
947
1061
1171
1273
13121
14121
15121
16121
17121
18121
19242
20484
21661
22661
23661
241093
251753
261807
273053
283613
293613
303613
315461
325461
338011
348011
358011
368011
3710081
3816381

[1,3,5,7,7,13,19,23,31,47,61,71,73,121,121,121,
 121,121,121,242,484,661,661,661,1093,1753,1807,
 3053,3613,3613,3613,5461,5461,8011,8011,8011,8011,
 10081,16381]