Minimum number k for which the digital sum of k*n is 5*n.

Terms

a(0) =0a(1) =5a(2) =14a(3) =23a(4) =122a(5) =599a(6) =833a(7) =1427a(8) =9986a(9) =11111a(10) =599999a(11) =590909a(12) =749999a(13) =3769223a(14) =13571357a(15) =53333333a(16) =187499993a(17) =294117647a(18) =1111111111a(19) =3684210521a(20) =149999999999a(21) =37619047619a(22) =590909090909a(23) =391304347826