Digits of n' end in n, where n' is the arithmetic derivative of n.

Terms

a(0) =50000a(1) =87500a(2) =600000a(3) =987500a(4) =4782272a(5) =24800000a(6) =45600000a(7) =85650000a(8) =95200000a(9) =962650000a(10) =999987500a(11) =2999062272a(12) =4285650000a(13) =7500000000a(14) =9977650000a(15) =9999987500a(16) =23076922368a(17) =74837600000a(18) =80000000000a(19) =85479410112a(20) =90000000000a(21) =280000000000a(22) =480000000000