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A028871 as a simple table

na(n)
12
27
323
447
579
6167
7223
8359
9439
10727
11839
121087
131223
141367
151847
162207
172399
183023
193719
203967
214759
225039
235623
245927
257919
268647
2710607
2811447
2913687
3014159
3114639
3216127
3317159
3418223
3519319
3621023
3724023
3825919
3928559
4029927

[2,7,23,47,79,167,223,359,439,727,839,1087,1223,
 1367,1847,2207,2399,3023,3719,3967,4759,5039,5623,
 5927,7919,8647,10607,11447,13687,14159,14639,
 16127,17159,18223,19319,21023,24023,25919,28559,
 29927]