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A165198 as a simple table

na(n)
12
22
32
43
57
63
73
87
97
103
113
123
133
145
1513
1631
17127
18727
1931
20127
21241
22727
2345361
2445361
255
265
275
285
2913
3031
31127
32727
3313
3431
35127
36727
3713
3813
3931
4031
41127
42127
43727
44727
4531
4631
4731
4831
49127
50241
51127
52241
53127
54127
55241
56241
57727
58727
59727
60727
6145361
6245361
6345361

[2,2,2,3,7,3,3,7,7,3,3,3,3,5,13,31,127,727,31,127,
 241,727,45361,45361,5,5,5,5,13,31,127,727,13,31,
 127,727,13,13,31,31,127,127,727,727,31,31,31,31,
 127,241,127,241,127,127,241,241,727,727,727,727,
 45361,45361,45361]