Triangular numbers whose digit reversal is a pentagonal number (A000326).
A115682
Triangular numbers whose digit reversal is a pentagonal number (A000326).
Terms
- a(0) =1a(1) =10a(2) =15a(3) =21a(4) =210a(5) =62481a(6) =67896a(7) =557040a(8) =2618616a(9) =10095771a(10) =10550121a(11) =28883800a(12) =62490610a(13) =1524872700a(14) =2708516800a(15) =5491258003a(16) =103352174628a(17) =299536839001
External references
- oeis: A115682