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A121854 a(n) = floor(Pi*(sqrt(n))). 18

%I

%S 0,3,4,5,6,7,7,8,8,9,9,10,10,11,11,12,12,12,13,13,14,14,14,15,15,15,

%T 16,16,16,16,17,17,17,18,18,18,18,19,19,19,19,20,20,20,20,21,21,21,21,

%U 21,22,22,22,22,23,23,23,23,23,24,24,24

%N a(n) = floor(Pi*(sqrt(n))).

%H Vincenzo Librandi, <a href="/A121854/b121854.txt">Table of n, a(n) for n = 0..1000</a>

%t Table[Floor[\[Pi] Sqrt[n]],{n,0,65}] (* _Harvey P. Dale_, Apr 22 2011 *)

%Y Cf. A121275, A121276.

%K nonn,easy,changed

%O 0,2

%A _Mohammad K. Azarian_, Aug 30 2006

%E Offset corrected and b-file updated by _Ivan Panchenko_, Nov 13 2013

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Last modified February 25 02:54 EST 2020. Contains 332217 sequences. (Running on oeis4.)