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A139700 as a simple table

na(n)
11
231
391
4211
5451
6931
71891
83811
97651
1015331
1130691
1261411
13122851
14245731
15491491
16983011
171966051
183932131
197864291
2015728611
2131457251
2262914531
23125829091
24251658211
25503316451
261006632931
272013265891
284026531811
298053063651
3016106127331

[1,31,91,211,451,931,1891,3811,7651,15331,30691,
 61411,122851,245731,491491,983011,1966051,3932131,
 7864291,15728611,31457251,62914531,125829091,
 251658211,503316451,1006632931,2013265891,
 4026531811,8053063651,16106127331]