a(n) is the minimal value of k >= 0, such that the concatenation of the decimal digits of n,n+1,...,n+k is divisible by the digit sum of the concatenation, or -1 if no such k is known.

A333687

a(n) is the minimal value of k >= 0, such that the concatenation of the decimal digits of n,n+1,...,n+k is divisible by the digit sum of the concatenation, or -1 if no such k is known.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =2a(11) =0a(12) =1a(13) =2a(14) =42a(15) =4a(16) =3a(17) =0a(18) =1a(19) =0a(20) =0a(21) =1a(22) =17a(23) =0a(24) =131a(25) =26a(26) =0a(27) =16a(28) =11a(29) =0

External references