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A078882 as a simple table

na(n)
11
21
33
43
51
63
77
87
93
101
111
121
133
147
1515
1615
177
183
193
201
211
221
231
241
251
261
273
283
297
3015
3131
3231
3315

[1,1,3,3,1,3,7,7,3,1,1,1,3,7,15,15,7,3,3,1,1,1,1,
 1,1,1,3,3,7,15,31,31,15]