a(1)=2, a(2)=3, for n >= 3, a(n) = 2*(gpf(a(n-1)) + gpf(a(n-2))) + 1, where gpf(n) is the greatest prime factor of n.
A202211
a(1)=2, a(2)=3, for n >= 3, a(n) = 2*(gpf(a(n-1)) + gpf(a(n-2))) + 1, where gpf(n) is the greatest prime factor of n.
Terms
- a(0) =2a(1) =3a(2) =11a(3) =29a(4) =81a(5) =65a(6) =33a(7) =49a(8) =37a(9) =89a(10) =253a(11) =225a(12) =57a(13) =49a(14) =53a(15) =121a(16) =129a(17) =109a(18) =305a(19) =341a(20) =185a(21) =137a(22) =349a(23) =973a(24) =977a(25) =2233a(26) =2013a(27) =181a(28) =485a(29) =557
External references
- oeis: A202211