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A065521 as a simple table

na(n)
12
21
31
41
59
611
711
813
913
1011
1113
1235
1337
1441
1543
1643
1743
1847
1947
2049
2153
2253
2355
2455
2553
2655
2759
2861
2965
3067
31121
32125
33127
34133
35131
36137
37139
38141
39145
40147
41149
42155
43153
44159
45163
46169
47165
48161
49165
50171
51175
52177
53183
54181
55183
56185
57187
58193
59195
60199

[2,1,1,1,9,11,11,13,13,11,13,35,37,41,43,43,43,47,
 47,49,53,53,55,55,53,55,59,61,65,67,121,125,127,
 133,131,137,139,141,145,147,149,155,153,159,163,
 169,165,161,165,171,175,177,183,181,183,185,187,
 193,195,199]