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

A333830

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

Terms

    a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =1a(10) =9a(11) =3a(12) =9a(13) =18a(14) =333a(15) =36a(16) =29a(17) =9a(18) =12a(19) =2a(20) =3a(21) =9a(22) =135a(23) =6a(24) =1218a(25) =216a(26) =9a(27) =126a(28) =90a(29) =3

External references