A017969 - OEIS

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A017969

Powers of sqrt(21) rounded up.

1, 5, 21, 97, 441, 2021, 9261, 42440, 194481, 891224, 4084101, 18715702, 85766121, 393029742, 1801088541, 8253624573, 37822859361, 173326116022, 794280046581, 3639848436451, 16679880978201, 76436817165461

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..700

MATHEMATICA

Ceiling[(Sqrt[21])^Range[0, 40]] (* Vincenzo Librandi, Nov 21 2011 *)

PROG

(Magma) [Ceiling(Sqrt(21^n)): n in [0..30]]; // Vincenzo Librandi, Nov 21 2011

CROSSREFS

Sequence in context: A159289 A201869 A017968 * A050897 A338673 A199215

Adjacent sequences: A017966 A017967 A017968 * A017970 A017971 A017972

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved