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A027755 as a simple table

na(n)
15
27
311
417
547
661
7137
8277
9311
10347
11467
12557
13761
14997
151061
161487
171811
182357
192657
203911
214561
225261
235407
245857
256011
266977
277487
288377
298747
309511
3111777
3212437
3313577
3414767
3516007
3617827
3718637
3818911
3921467
4023567
4125127

[5,7,11,17,47,61,137,277,311,347,467,557,761,997,
 1061,1487,1811,2357,2657,3911,4561,5261,5407,5857,
 6011,6977,7487,8377,8747,9511,11777,12437,13577,
 14767,16007,17827,18637,18911,21467,23567,25127]