This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A050504 #25 Jun 15 2025 18:32:43
%S A050504 0,1,3,5,8,10,13,16,19,23,26,29,33,36,40,44,48,52,55,59,63,68,72,76,
%T A050504 80,84,88,93,97,102,106,110,115,119,124,129,133,138,142,147,152,156,
%U A050504 161,166,171,176,180,185,190,195,200,205,210,215,220,225
%N A050504 Integer part of n*log(n).
%C A050504 Additive basis of order 3: all nonnegative integers can be written as a sum of three elements from this sequence. It appears that other than 7, 12, and 25, all numbers can be written as the sum of two members of this sequence. - _Charles R Greathouse IV_, Apr 23 2012
%H A050504 Charles R. Greathouse IV, <a href="/A050504/b050504.txt">Table of n, a(n) for n = 1..10000</a>
%H A050504 <a href="/index/Ab#basis_03">Index entries for sequences that are an additive basis</a>, order 3.
%F A050504 a(n) = floor(n*log(n)). - _Enrique Pérez Herrero_, Jul 29 2009
%t A050504 Table[Floor[n*Log[n]],{n,90}] (* _Harvey P. Dale_, May 29 2024 *)
%o A050504 (PARI) a(n)=n*log(n)\1 \\ _Charles R Greathouse IV_, Apr 23 2012
%Y A050504 See A050503 for more information.
%K A050504 nonn,easy
%O A050504 1,3
%A A050504 _N. J. A. Sloane_, Dec 27 1999