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%I #11 Sep 08 2022 08:44:43
%S 1,5,21,97,441,2021,9261,42440,194481,891224,4084101,18715702,
%T 85766121,393029742,1801088541,8253624573,37822859361,173326116022,
%U 794280046581,3639848436451,16679880978201,76436817165461
%N Powers of sqrt(21) rounded up.
%H Vincenzo Librandi, <a href="/A017969/b017969.txt">Table of n, a(n) for n = 0..700</a>
%t Ceiling[(Sqrt[21])^Range[0,40]] (* _Vincenzo Librandi_, Nov 21 2011 *)
%o (Magma) [Ceiling(Sqrt(21^n)): n in [0..30]]; // _Vincenzo Librandi_, Nov 21 2011
%K nonn
%O 0,2
%A _N. J. A. Sloane_
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