Triangular numbers not divisible by 10 whose reverse is pentagonal.

A066758

Triangular numbers not divisible by 10 whose reverse is pentagonal.

Terms

    a(0) =0a(1) =1a(2) =15a(3) =21a(4) =62481a(5) =67896a(6) =2618616a(7) =10095771a(8) =10550121a(9) =5491258003a(10) =103352174628a(11) =299536839001

External references