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A129801 as a simple table

na(n)
11
21
33
41
55
69
71
87
913
1019
111
129
1317
1425
1533
161
1711
1821
1931
2041
2151
221
2313
2425
2537
2649
2761
2873
291
3015
3129
3243
3357
3471
3585
3699
371
3817
3933
4049
4165
4281
4397
44113
45129
461
4719
4837
4955
5073
5191
52109
53127
54145
55163
561
5721
5841
5961
6081
61101
62121
63141
64161
65181
66201

[1,1,3,1,5,9,1,7,13,19,1,9,17,25,33,1,11,21,31,41,
 51,1,13,25,37,49,61,73,1,15,29,43,57,71,85,99,1,
 17,33,49,65,81,97,113,129,1,19,37,55,73,91,109,
 127,145,163,1,21,41,61,81,101,121,141,161,181,201]