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A087506 as a simple table

na(n)
15
213
371
4127
5163
6197
7227
8307
9317
10409
11523
12587
13593
14761
15857
16947
171151
181321
191373
201783
211861
221973
232039
242273
252417
262543
273049
283083
293457
303463
313697
323739
334093
344243
354253
364463
374483
384519
394583
404657
414723
424751
435171
445179
455519
465591

[5,13,71,127,163,197,227,307,317,409,523,587,593,
 761,857,947,1151,1321,1373,1783,1861,1973,2039,
 2273,2417,2543,3049,3083,3457,3463,3697,3739,4093,
 4243,4253,4463,4483,4519,4583,4657,4723,4751,5171,
 5179,5519,5591]