a(n) and floor(a(n)/7) are both squares; i.e., squares which remain squares when written in base 7 and last digit is removed.

A055859

a(n) and floor(a(n)/7) are both squares; i.e., squares which remain squares when written in base 7 and last digit is removed.

Terms

    a(0) =0a(1) =1a(2) =4a(3) =9a(4) =64a(5) =256a(6) =2025a(7) =16129a(8) =64516a(9) =514089a(10) =4096576a(11) =16386304a(12) =130576329a(13) =1040514049a(14) =4162056196a(15) =33165873225a(16) =264286471744

External references