a(n) is the smallest k > 0 such that the first n multiples of k have the same sum of digits, but (n+1)k has a different one. a(n)=0 if no such k exists.
A238088
a(n) is the smallest k > 0 such that the first n multiples of k have the same sum of digits, but (n+1)k has a different one. a(n)=0 if no such k exists.
Terms
- a(0) =1a(1) =63a(2) =72a(3) =135a(4) =81a(5) =27a(6) =36a(7) =1881a(8) =0a(9) =9a(10) =549a(11) =1683a(12) =1782a(13) =3465a(14) =1728a(15) =1287a(16) =1386a(17) =891a(18) =0a(19) =1188a(20) =95904a(21) =693a(22) =87912a(23) =204795a(24) =81918a(25) =42957a(26) =73926a(27) =792a(28) =0a(29) =40959
External references
- oeis: A238088