Numbers k such that k divides the (left) concatenation of all numbers <= k written in base 4 (most significant digit on right and removing all least significant zeros before concatenation).

A029521

Numbers k such that k divides the (left) concatenation of all numbers <= k written in base 4 (most significant digit on right and removing all least significant zeros before concatenation).

Terms

    a(0) =1a(1) =3a(2) =15a(3) =969a(4) =1107a(5) =136193a(6) =538019a(7) =2177475a(8) =2799315a(9) =5948555

External references