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A176570 as a simple table

na(n)
12
23
39
45
57
615
721
811
925
1013
1133
1217
1335
1419
1539
1623
1749
1851
1955
2057
2129
2231
2365
2469
2537
2677
2741
2885
2943
3087
3191
3293
3347
3495
3553
36111
37115
3859
39119
40121
4161
42123
43129
44133
4567
46141
4771
48143
49145
5073
51155
5279
53159
54161
5583
56169
57177
5889
59183
60185
61187
6297
63201
64101
65203

[2,3,9,5,7,15,21,11,25,13,33,17,35,19,39,23,49,51,
 55,57,29,31,65,69,37,77,41,85,43,87,91,93,47,95,
 53,111,115,59,119,121,61,123,129,133,67,141,71,
 143,145,73,155,79,159,161,83,169,177,89,183,185,
 187,97,201,101,203]