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A047838 as a simple table

na(n)
21
33
47
511
617
723
831
939
1049
1159
1271
1383
1497
15111
16127
17143
18161
19179
20199
21219
22241
23263
24287
25311
26337
27363
28391
29419
30449
31479
32511
33543
34577
35611
36647
37683
38721
39759
40799
41839
42881
43923
44967
451011
461057
471103
481151
491199
501249
511299
521351
531403

[1,3,7,11,17,23,31,39,49,59,71,83,97,111,127,143,
 161,179,199,219,241,263,287,311,337,363,391,419,
 449,479,511,543,577,611,647,683,721,759,799,839,
 881,923,967,1011,1057,1103,1151,1199,1249,1299,
 1351,1403]