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A000277 3*n - 2*floor(sqrt(4*n+5)) + 5. 1

%I

%S 1,2,5,6,9,10,13,16,17,20,23,24,27,30,33,34,37,40,43,44,47,50,53,56,

%T 57,60,63,66,69,70,73,76,79,82,85,86,89,92,95,98,101,102,105,108,111,

%U 114,117,120,121,124,127,130,133,136,139,140,143,146,149,152,155

%N 3*n - 2*floor(sqrt(4*n+5)) + 5.

%H T. D. Noe, <a href="/A000277/b000277.txt">Table of n, a(n) for n = 0..1000</a>

%t Table[3*n - 2*Floor[Sqrt[4 n + 5]] + 5, {n, 0, 100}] (* _T. D. Noe_, Jun 19 2012 *)

%o (PARI) a(n)=3*n-2*sqrtint(4*n+5)+5

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_, based on a message from Michael S. Cann Jr. (mscannjr(AT)gmail.com)

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Last modified August 5 06:46 EDT 2020. Contains 336209 sequences. (Running on oeis4.)