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A100531 as a simple table

na(n)
01
13
27
313
421
523
627
733
841
943
1047
1153
1261
1363
1467
1573
1681
1783
1887
1993
20101
21103
22107
23113
24121
25123
26127
27133
28141
29143
30147
31153
32161
33163
34167
35173
36181
37183
38187
39193
40201
41203
42207
43213
44221
45223
46227
47233
48241
49243
50247
51253
52261
53263
54267
55273
56281
57283

[1,3,7,13,21,23,27,33,41,43,47,53,61,63,67,73,81,
 83,87,93,101,103,107,113,121,123,127,133,141,143,
 147,153,161,163,167,173,181,183,187,193,201,203,
 207,213,221,223,227,233,241,243,247,253,261,263,
 267,273,281,283]