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A245935 as a simple table

na(n)
12
22
33
45
57
65
77
85
95
1012
1112
125
1312
1412
1512
1617
1712
1817
1912
2012
2117
2212
2317
2412
2517
2641
2729
2841
2929
3029
3141
3229
3341
3429
3541
3629
3729
3841
3929
4041
4129
4229
4341
4429
4541
4629
4741
4829
4929
5041
5129
5241
5329
5429
5570
5670
5729
5870
5970
6070
6129
6270
6370
6429
6570
6670
6770

[2,2,3,5,7,5,7,5,5,12,12,5,12,12,12,17,12,17,12,
 12,17,12,17,12,17,41,29,41,29,29,41,29,41,29,41,
 29,29,41,29,41,29,29,41,29,41,29,41,29,29,41,29,
 41,29,29,70,70,29,70,70,70,29,70,70,29,70,70,70]