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A286942 as a simple table

na(n)
11
22
31
43
55
61
75
87
911
1013
1117
1219
1323
1425
1529
161
177
1811
1913
2017
2119
2223
2329
2431
2537
2641
2743
2847
2949
3053
3159
3261
3367
3471
3573
3677
3779
3883
3989
4091
4197
42101
43103
44107
45109
46113
47119
48121
49127
50131
51133
52137
53139
54143
55149
56151
57157
58161
59163
60167
61169
62173

[1,2,1,3,5,1,5,7,11,13,17,19,23,25,29,1,7,11,13,
 17,19,23,29,31,37,41,43,47,49,53,59,61,67,71,73,
 77,79,83,89,91,97,101,103,107,109,113,119,121,127,
 131,133,137,139,143,149,151,157,161,163,167,169,
 173]