a(n) is the smallest number x > 1 such that n appears as a substring of the decimal representations of the numbers [0..x] exactly x times.

A163500

a(n) is the smallest number x > 1 such that n appears as a substring of the decimal representations of the numbers [0..x] exactly x times.

Terms

    a(0) =199981a(1) =28263827a(2) =371599983a(3) =499999984a(4) =10000000000a(5) =9500000000a(6) =9465000000a(7) =9465000000a(8) =10000000000

External references