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 A326052 #6 Jun 04 2019 16:33:26 %S A326052 1,2,0,4,5,3,0,8,6,10,0,9,13,7,-3,16,17,15,0,20,11,11,0,21,25,26,-3, %T A326052 21,29,12,0,32,19,34,-7,33,37,19,-3,40,41,32,0,33,27,23,0,45,42,50,-3, %U A326052 52,53,24,-11,49,35,58,0,42,61,31,-10,64,65,52,0,68,43,28,0,69,73,74,-18,57,59,36,0,80,51,82,0,74,85,43,-3,77 %N A326052 a(n) = n - A050452(n), where A050452 is the sum of divisors of the form 4k+3. %H A326052 Antti Karttunen, <a href="/A326052/b326052.txt">Table of n, a(n) for n = 1..20000</a> %F A326052 a(n) = n - A050452(n). %o A326052 (PARI) %o A326052 A050452(n) = sumdiv(n, d, d*(3==(d % 4))); %o A326052 A326052(n) = (n-A050452(n)); %Y A326052 Cf. A050452, A326047, A326049. %K A326052 sign %O A326052 1,2 %A A326052 _Antti Karttunen_, Jun 04 2019