Maximal base 5 run length is 2.

Terms

a(0) =6a(1) =12a(2) =18a(3) =24a(4) =25a(5) =30a(6) =32a(7) =33a(8) =34a(9) =37a(10) =43a(11) =49a(12) =50a(13) =56a(14) =60a(15) =61a(16) =63a(17) =64a(18) =68a(19) =74a(20) =75a(21) =81a(22) =87a(23) =90a(24) =91a(25) =92a(26) =94a(27) =99a(28) =100a(29) =106