a(1)=a(2)=2; thereafter, a(n)=gpf(1+a(n-1)a(n-2)), where gpf is greatest prime factor.
A259828
a(1)=a(2)=2; thereafter, a(n)=gpf(1+a(n-1)a(n-2)), where gpf is greatest prime factor.
Terms
- a(0) =2a(1) =2a(2) =5a(3) =11a(4) =7a(5) =13a(6) =23a(7) =5a(8) =29a(9) =73a(10) =353a(11) =859a(12) =8423a(13) =92761a(14) =856717a(15) =126948763a(16) =122613509a(17) =2102184467a(18) =2530079
External references
- oeis: A259828