Numbers k such that the sum of the reverses of 1,2,...,k is a perfect square.

A074238

Numbers k such that the sum of the reverses of 1,2,...,k is a perfect square.

Terms

    a(0) =1a(1) =8a(2) =26a(3) =53a(4) =3087a(5) =6173a(6) =8091a(7) =12330a(8) =18358a(9) =42898a(10) =294847a(11) =27382381a(12) =49290155a(13) =426131190a(14) =1350661780a(15) =3161620702a(16) =4461944219a(17) =17625479383a(18) =40766706170a(19) =61554358125a(20) =270930998357

External references