a(n) is the smallest number m such that phi(10^n + m) = 10^n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =111a(4) =291a(5) =651a(6) =4251a(7) =165751a(8) =64101a(9) =78501a(10) =222501a(11) =62501601a(12) =62516001a(13) =62660001a(14) =2441447211a(16) =390625025601a(17) =2482366251a(18) =2851006251a(20) =390881000001a(21) =412041406251