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

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, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 23, 24, 24, 24

Offset: 0

Author

Mohammad K. Azarian, Aug 30 2006

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A121275, A121276.

Programs

Mathematica

Table[Floor[\[Pi] Sqrt[n]],{n,0,65}]  (* Harvey P. Dale, Apr 22 2011 *)

Extensions

Offset corrected and b-file updated by Ivan Panchenko, Nov 13 2013