A018074 Powers of fourth root of 10 rounded up.

1, 2, 4, 6, 10, 18, 32, 57, 100, 178, 317, 563, 1000, 1779, 3163, 5624, 10000, 17783, 31623, 56235, 100000, 177828, 316228, 562342, 1000000, 1778280, 3162278, 5623414, 10000000, 17782795, 31622777, 56234133, 100000000, 177827942, 316227767, 562341326, 1000000000

Offset

0,2

Links

Table of n, a(n) for n=0..36.

Mathematica

Ceiling[(Power[10, (4 )^-1])^Range[0, 50]]  (* Harvey P. Dale, Mar 18 2011 *)

Prog

(PARI) a(n) = sqrtnint(10^n-1, 4) + 1; \\ Michel Marcus, Jun 26 2024

Crossrefs

Cf. A011007, A017936 (bisection), A308467.

Sequence in context: A203175 A102477 A232582 * A288465 A000067 A133140

Adjacent sequences: A018071 A018072 A018073 * A018075 A018076 A018077

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

More terms from Michel Marcus, Aug 21 2019

Status

approved