a(1) = 8; for n > 1, a(n) is the largest integer m such that m = ((2*x*a(n-1)) / (x+1)) - x, with x a positive nontrivial divisor of m.
A338026
a(1) = 8; for n > 1, a(n) is the largest integer m such that m = ((2*x*a(n-1)) / (x+1)) - x, with x a positive nontrivial divisor of m.
Terms
- a(0) =8a(1) =9a(2) =10a(3) =12a(4) =15a(5) =20a(6) =28a(7) =42a(8) =66a(9) =110a(10) =190a(11) =342a(12) =630a(13) =1190a(14) =2278a(15) =4422a(16) =8646a(17) =17030a(18) =33670a(19) =66822a(20) =132900a(21) =264758a(22) =528034a(23) =1053990a(24) =2105077a(25) =4205820a(26) =8405840a(27) =16803405a(28) =33595212a(29) =67173930
External references
- oeis: A338026