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A001218 as a simple table

na(n)
01
13
29
327
481
543
629
787
861
983
1049
1147
1241
1323
1469
157
1621
1763
1889
1967
201
213
229
2327
2481
2543
2629
2787
2861
2983
3049
3147
3241
3323
3469
357
3621
3763
3889
3967
401
413
429
4327
4481
4543
4629
4787
4861
4983
5049
5147
5241
5323
5469
557
5621
5763
5889
5967

[1,3,9,27,81,43,29,87,61,83,49,47,41,23,69,7,21,
 63,89,67,1,3,9,27,81,43,29,87,61,83,49,47,41,23,
 69,7,21,63,89,67,1,3,9,27,81,43,29,87,61,83,49,47,
 41,23,69,7,21,63,89,67]