login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A061812 Numbers k such that floor(Pi*k) is a square. 1

%I #19 Mar 06 2023 20:40:23

%S 0,3,8,26,32,46,54,92,115,199,268,306,326,368,390,436,796,828,861,963,

%T 1071,1146,1304,1345,1429,1472,1560,2193,2246,2300,2465,2636,2873,

%U 2995,3120,3312,3377,3443,3713,3782,3922,3993,4137,4738,4816,5297,6062,6239

%N Numbers k such that floor(Pi*k) is a square.

%H Harry J. Smith, <a href="/A061812/b061812.txt">Table of n, a(n) for n = 0..1000</a>

%e Floor(Pi*861) = 2704 = 52^2, so 861 is a term;

%e floor(Pi*1146) = 3600 = 60^2, so 1146 is a term.

%t Select[Range[0,7000],IntegerQ[Sqrt[Floor[Pi #]]]&] (* _Harvey P. Dale_, May 14 2011 *)

%o (PARI) for(n=0,1200, if(issquare(floor(Pi*n)),print(n)))

%o (PARI) { n=-1; for (a=0, 3714376, if (issquare(floor(Pi*a)), write("b061812.txt", n++, " ", a)) ) } \\ _Harry J. Smith_, Jul 28 2009

%Y Cf. A022844.

%K easy,nice,nonn

%O 0,2

%A _Jason Earls_, Jul 01 2001

%E More terms from _Naohiro Nomoto_, Oct 04 2001

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)