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A176069 as a simple table

na(n)
121
257
391
4111
5133
6183
7381
8553
9703
10813
11871
12993
131057
141191
151261
161333
171561
181641
191807
201893
211981
222071
232257
242353
252653
262757
272863
283193
293661
304033
314291
324971
335257
345403
355853
366807
376973
387141
397311
407483
418373
428557
438743
449121
459313
469507
479703

[21,57,91,111,133,183,381,553,703,813,871,993,
 1057,1191,1261,1333,1561,1641,1807,1893,1981,2071,
 2257,2353,2653,2757,2863,3193,3661,4033,4291,4971,
 5257,5403,5853,6807,6973,7141,7311,7483,8373,8557,
 8743,9121,9313,9507,9703]