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A025587 as a simple table

na(n)
01
13
27
315
427
5703
61819
74255
84591
99663
1026623
1160975
1277671
13113383
14159487
151212415
162684647
173041127
183873535
194637979
205656191
216416623
226631675
2319638399
2480049391
25210964383
26319804831
271410123943
2870141259775
2977566362559

[1,3,7,15,27,703,1819,4255,4591,9663,26623,60975,
 77671,113383,159487,1212415,2684647,3041127,
 3873535,4637979,5656191,6416623,6631675,19638399,
 80049391,210964383,319804831,1410123943,
 70141259775,77566362559]