Least k>1 such that reverse complement of first n terms of A006928 repeats beginning at k-th term.

Terms

a(0) =2a(1) =4a(2) =5a(3) =7a(4) =6a(5) =5a(6) =4a(7) =3a(8) =2a(9) =28a(10) =27a(11) =26a(12) =25a(13) =24a(14) =23a(15) =61a(16) =60a(17) =344a(18) =343a(19) =342a(20) =341a(21) =340a(22) =339a(23) =338a(24) =337a(25) =336a(26) =335a(27) =334a(28) =333a(29) =332