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A280740 as a simple table

na(n)
12
23
33
45
55
65
77
87
97
107
1111
1211
1311
1413
1513
1613
1713
1813
1913
2013
2113
2213
2317
2419
2519
2619
2719
2823
2923
3023
3125
3225
3325
3425
3529
3629
3729
3829
3931
4031
4131
4231
4331
4431
4531
4631
4731
4831
4937
5037
5137
5237
5337
5437
5541
5641
5741
5841
5941
6041
6141
6241
6343
6443
6543
6647
6747
6847
6947
7053
7153
7253
7353
7453
7553
7653
7753
7853
7953

[2,3,3,5,5,5,7,7,7,7,11,11,11,13,13,13,13,13,13,
 13,13,13,17,19,19,19,19,23,23,23,25,25,25,25,29,
 29,29,29,31,31,31,31,31,31,31,31,31,31,37,37,37,
 37,37,37,41,41,41,41,41,41,41,41,43,43,43,47,47,
 47,47,53,53,53,53,53,53,53,53,53,53]