a(1) = 2, a(2) = 3; for n>2, a(n) = least prime such that a(n-2) is the largest prime factor of a(n)+a(n-1).
A126607
a(1) = 2, a(2) = 3; for n>2, a(n) = least prime such that a(n-2) is the largest prime factor of a(n)+a(n-1).
Terms
- a(0) =2a(1) =3a(2) =5a(3) =7a(4) =3a(5) =11a(6) =7a(7) =37a(8) =5a(9) =439a(10) =11a(11) =7013a(12) =379a(13) =27673a(14) =373a(15) =54973a(16) =977a(17) =548753a(18) =4229a(19) =7678313a(20) =10009a(21) =230339381a(22) =27763a(23) =5067438619a(24) =197297a(25) =273641488129a(26) =375209a(28) =5322971a(30) =60154183
External references
- oeis: A126607