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A068697 as a simple table

na(n)
13
213
30
423252729
52527293133
60
757911131517
84547495153555759
90
10135791113151719
1187899193959799101103105107
120
1323252729313335373941434547
14357911131517192123252729
150

[3,13,0,23252729,2527293133,0,57911131517,
 4547495153555759,0,135791113151719,
 87899193959799101103105107,0,
 23252729313335373941434547,
 357911131517192123252729,0]