5^a(n) is smallest power of 5 beginning with n.

Terms

a(0) =0a(1) =2a(2) =5a(3) =11a(4) =1a(5) =4a(6) =7a(7) =50a(8) =10a(9) =63a(10) =23a(11) =3a(12) =56a(13) =26a(14) =6a(15) =69a(16) =49a(17) =29a(18) =9a(19) =82a(20) =62a(21) =42a(22) =22a(23) =12a(24) =2a(25) =75a(26) =55a(27) =45a(28) =25a(29) =15