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A065688 as a simple table

na(n)
12
23
35
45
55
67
711
811
911
1011
1111
1211
1311
1411
1511
1613
1713
1813
1913
2029
2129
2219
2319

[2,3,5,5,5,7,11,11,11,11,11,11,11,11,11,13,13,13,
 13,29,29,19,19]