Where the prime race 4k-1 vs. 4k+1 changes leader.

Terms

a(0) =3a(1) =26861a(2) =26879a(3) =616841a(4) =617039a(5) =617269a(6) =617471a(7) =617521a(8) =617587a(9) =617689a(10) =617723a(11) =622813a(12) =623387a(13) =623401a(14) =623851a(15) =623933a(16) =624031a(17) =624097a(18) =624191a(19) =624241a(20) =624259a(21) =626929a(22) =626963a(23) =627353a(24) =627391a(25) =627449a(26) =627511a(27) =627733a(28) =627919a(29) =628013