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A075705 as a simple table

na(n)
15
27
311
423
547
683
7107
8263
9347
10467
11503
12863
13887
141283
151487
161823
171907
182027
192063
202447
212903
223203
233623
244007
254127
264547
274703
284787
295387
305807
317523
327703
338147
348423
3511423
3611483
3711807
3812107
3912227
4012647
4112983
4213043
4313163
4414087
4514207

[5,7,11,23,47,83,107,263,347,467,503,863,887,1283,
 1487,1823,1907,2027,2063,2447,2903,3203,3623,4007,
 4127,4547,4703,4787,5387,5807,7523,7703,8147,8423,
 11423,11483,11807,12107,12227,12647,12983,13043,
 13163,14087,14207]