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 A105339 #7 Apr 18 2025 14:43:20 %S A105339 0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,136,153,171,190,210, %T A105339 231,253,276,300,325,351,378,406,435,465,496,528,561,595,630,666,703, %U A105339 741,780,820,861,903,946,990,11,57,104,152,201,251,302,354,407,461,516,572,629 %N A105339 a(n) = n*(n+1)/2 mod 1024. %C A105339 Periodic with period length 2048. - _Ray Chandler_, Apr 18 2025 %H A105339 <a href="/index/Rec#order_2047">Index entries for linear recurrences with constant coefficients</a>, order 2047. %t A105339 Mod[Accumulate[Range[0,100]],1024] (* _Harvey P. Dale_, Jun 30 2017 *) %Y A105339 See A105198 for further information. %K A105339 nonn %O A105339 0,3 %A A105339 _Oscar Takeshita_, May 01 2005