a(1)=1. Thereafter, a(n) = n*a(n-1) if the number of divisors of n*a(n-1) is <= the number of divisors of n+a(n-1) or a(n) = n+a(n-1) if n*a(n-1) has more divisors than n+a(n-1).
A134189
a(1)=1. Thereafter, a(n) = n*a(n-1) if the number of divisors of n*a(n-1) is <= the number of divisors of n+a(n-1) or a(n) = n+a(n-1) if n*a(n-1) has more divisors than n+a(n-1).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =9a(4) =14a(5) =20a(6) =27a(7) =35a(8) =44a(9) =54a(10) =65a(11) =77a(12) =1001a(13) =1015a(14) =1030a(15) =1046a(16) =1063a(17) =1081a(18) =20539a(19) =20559a(20) =431739a(21) =431761a(22) =9930503a(23) =9930527a(24) =248263175a(25) =248263201a(26) =248263228a(27) =248263256a(28) =248263285a(29) =248263315
External references
- oeis: A134189