Where the prime race 3k-1 vs. 3k+1 changes leader.

Terms

a(0) =2a(1) =608981813029a(2) =608981813507a(3) =608981813683a(4) =608981813819a(5) =608981814127a(6) =608981814143a(7) =608981818999a(8) =608981820977a(9) =608981826877a(10) =608981826977a(11) =608981827873a(12) =608981828201a(13) =608981836363a(14) =608981836493a(15) =608981836681a(16) =608981836973a(17) =608981836993a(18) =608981837063