a(n) = 91 written in base n.

Terms

a(1) =1011011a(2) =10101a(3) =1123a(4) =331a(5) =231a(6) =160a(7) =133a(8) =111a(9) =91a(10) =83a(11) =77a(12) =70a(13) =67a(14) =61