a(1) = 5, a(n) = smallest (nontrivial) multiple of a(n-1) containing n digits, a(n) not equal to 10*a(n-1). Also a(n) is not divisible by 10.
A080449
a(1) = 5, a(n) = smallest (nontrivial) multiple of a(n-1) containing n digits, a(n) not equal to 10*a(n-1). Also a(n) is not divisible by 10.
Terms
- a(0) =5a(1) =15a(2) =105a(3) =1155a(4) =10395a(5) =114345a(6) =1029105a(7) =11320155a(8) =101881395a(9) =1120695345a(10) =10086258105a(11) =110948839155
External references
- oeis: A080449