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 A176423 #28 Aug 20 2024 09:08:27 %S A176423 3,6,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38, %T A176423 39,40,42,44,45,46,48,49,50,51,52,54,55,56,57,58,60,62,63,64,65,66,68, %U A176423 69,70,72,74,75,76,77,78,80,81,82,84,85,86,87,88,90,91,92,93,94,95,96,98,99,100 %N A176423 Numbers that are the sum of at least three distinct nonnegative integers in arithmetic progression. %C A176423 According to the theorem in the December 1996 issue of Le Petit Vert, these numbers consist of 3, 6 and the composite numbers greater than 8. - _Peter Munn_, Aug 20 2024 %H A176423 Ray Chandler, <a href="/A176423/b176423.txt">Table of n, a(n) for n = 1..10000</a> %H A176423 Le Petit Vert, <a href="https://partage.apmeplorraine.fr/petitVert/PV47.pdf">Problem 47</a>, p.20, September 1996. (in French) %H A176423 Le Petit Vert, <a href="https://partage.apmeplorraine.fr/petitVert/PV48.pdf">Solution of problem 47</a>, pp. 21-22, December 1996. (in French) %Y A176423 Cf. A002808. %K A176423 nonn,easy %O A176423 1,1 %A A176423 _Christian Amet_, Apr 17 2010 %E A176423 Extended by _Ray Chandler_, Mar 23 2016