A069658 a(1) = 1; a(n) = smallest nontrivial n-digit perfect power.

1, 16, 121, 1024, 10201, 100489, 1002001, 10004569, 100020001, 1000014129, 10000200001, 100000147984, 1000002000001, 10000002149284, 100000020000001, 1000000025191729, 10000000200000001, 100000000621806289, 1000000002000000001

Offset: 1

Author

Amarnath Murthy, Apr 04 2002

Keywords

• nonn
• base

Comments

Powers of 10 are not allowed.

Crossrefs

Cf. A061432, A017936.

Programs

Mathematica

Join[{1},(Floor[Sqrt[10^Range[20]]]+1)^2] (* Harvey P. Dale, Mar 08 2022 *)

Formula

a(n) = (floor(sqrt(10)^(n-1))+1)^2 = (A017934(n-1)+1)^2. - Vladeta Jovovic, Jun 30 2002

Extensions

More terms from Sascha Kurz, Jan 28 2003