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

1,2

Comments

a(n) = 10^n for 6 <= n <= 500 (I haven't checked past 500.) - David Wasserman, Jan 05 2006

Links

Table of n, a(n) for n=1..17.

Example

a(1) = 1 because 1 begins with 2^0. a(5) = 16807 because 16807 begins with 2^4.

Crossrefs

Cf. A090568.

Cf. A067442.

Sequence in context: A368111 A367913 A210935 * A273375 A016934 A260182

Adjacent sequences: A090558 A090559 A090560 * A090562 A090563 A090564

Keyword

base,nonn

Author

Amarnath Murthy, Dec 11 2003

Extensions

Corrected and extended by David Wasserman, Jan 05 2006

Status

approved