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A051887 as a simple table

na(n)
12
22
32
42
52
65
717
811
911
1011
112
1223
137
1443
1519
163
175
182
197
203
2161
2253
232
2441
2547
262
275
287
2931
302
3147
3213
33113
347
35137
36103
3743
3841
3997
403
41173
4297
4341
4413
4597
4659
4729
4853
493
50107
51127
52197
533
54487
55433
5631
57281
58587
597
6089
6141
6247
63193
64239
6541
667
6731
6867

[2,2,2,2,2,5,17,11,11,11,2,23,7,43,19,3,5,2,7,3,
 61,53,2,41,47,2,5,7,31,2,47,13,113,7,137,103,43,
 41,97,3,173,97,41,13,97,59,29,53,3,107,127,197,3,
 487,433,31,281,587,7,89,41,47,193,239,41,7,31,67]