A090561 Least n-th power that begins with k^(n-1) for some k > 1.
1, 4, 64, 81, 16807, 1000000, 10000000, 100000000, 1000000000, 10000000000, 100000000000, 1000000000000, 10000000000000, 100000000000000, 1000000000000000, 10000000000000000, 100000000000000000
Offset: 1
Examples
a(1) = 1 because 1 begins with 2^0. a(5) = 16807 because 16807 begins with 2^4.
Extensions
Corrected and extended by David Wasserman, Jan 05 2006
Comments