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A087968 as a simple table

na(n)
11
21
39
41
51
61
71
81
927
1025
111
121
131
141
159
161
171
181
191
201
219
221
231
241
251
261
2781
281
291
3025
311
321
339
341
351
361
371
381
399
401
411
421
431
441
4527
461
471
481
491
50125
519
521
531
541
55121
561
579
581
591
601
611
621
6327
641
651
661
671
68289
699
7025
711
721
731
741
759
761
771
78169
791
801
81243
821
831
841
851
861
879
881
891
9025
911
921
939
941
951
961

[1,1,9,1,1,1,1,1,27,25,1,1,1,1,9,1,1,1,1,1,9,1,1,
 1,1,1,81,1,1,25,1,1,9,1,1,1,1,1,9,1,1,1,1,1,27,1,
 1,1,1,125,9,1,1,1,121,1,9,1,1,1,1,1,27,1,1,1,1,
 289,9,25,1,1,1,1,9,1,1,169,1,1,243,1,1,1,1,1,9,1,
 1,25,1,1,9,1,1,1]