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A247981 as a simple table

na(n)
12
25
313
441
5137
6149
7229
8293
9397
10509
11661
12677
13709
14761
15809
16877
17881
181217
191249
201277
211601
222053
232633
243637
253701
264481
274729
285101
295449
305749
315861
327121
337237
347517
358009
368089
378117
388377
399661
4014869
4114897
4218229
4319609
4420369
4520441
4621493
4722349
4823917
4924781
5024977
5125717

[2,5,13,41,137,149,229,293,397,509,661,677,709,
 761,809,877,881,1217,1249,1277,1601,2053,2633,
 3637,3701,4481,4729,5101,5449,5749,5861,7121,7237,
 7517,8009,8089,8117,8377,9661,14869,14897,18229,
 19609,20369,20441,21493,22349,23917,24781,24977,
 25717]