Pentagonal numbers not divisible by 10 whose reverse is triangular.

A066757

Pentagonal numbers not divisible by 10 whose reverse is triangular.

Terms

    a(0) =0a(1) =1a(2) =12a(3) =51a(4) =18426a(5) =69876a(6) =6168162a(7) =12105501a(8) =17759001a(9) =3008521945a(10) =100938635992a(11) =826471253301

External references