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A094963 as a simple table

na(n)
15
27
319
423
587
6107
7255
81539
92387
104457
115623
1215761
1322735
1427241
1586447

[5,7,19,23,87,107,255,1539,2387,4457,5623,15761,
 22735,27241,86447]