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A143798 as a simple table

na(n)
15
217
331
443
573
6101
7197
8241
9269
10283
11347
12521
13599
14811
15827
16829
171019
181049
191051
201153
211289
221787
232089
242143
252341
262689
272731
282969
293257
303259
313391
324051
334093
344129
354159
364217
374481
384721
394931
405881
416361
426793
436959
447759
458009
468233

[5,17,31,43,73,101,197,241,269,283,347,521,599,
 811,827,829,1019,1049,1051,1153,1289,1787,2089,
 2143,2341,2689,2731,2969,3257,3259,3391,4051,4093,
 4129,4159,4217,4481,4721,4931,5881,6361,6793,6959,
 7759,8009,8233]