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A108389 as a simple table

na(n)
1133999337137
2139779933779
3173139331177
4173399913979
5177793993177
6179993739971
7391331737931
8771319973999
9917377131371
10933971311913
11997331911711
121191777377177
139311933973733
149979333919939
1519979113377173
1631997131171111
1737137197179931
1837337319113911

[133999337137,139779933779,173139331177,
 173399913979,177793993177,179993739971,
 391331737931,771319973999,917377131371,
 933971311913,997331911711,1191777377177,
 9311933973733,9979333919939,19979113377173,
 31997131171111,37137197179931,37337319113911]