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 A176887 #11 Apr 18 2022 13:11:39 %S A176887 0,1,0,1,1,1,2,1,0,1,7,3,1,3,8,5,0,13,8,14,9,9,9,19,13,9,15,16,15,28, %T A176887 10,29,17,17,21,38,24,25,19,0,25,43,44,20,29,49,31,1,37,31,38,35,58, %U A176887 29,37,0,67,41,68,51,8,47,77,49,46,58,49,7,82,51,59,47,51,83,11,53,66,92,10 %N A176887 Let A001358(n) = prime(m)*prime(k). Then a(n) = abs(prime(m)*k - prime(k)*m). %C A176887 The sequence is defined by considering first m<=k, adding the difference prime(m)*k-prime(k)*m to the sequence if >=0, then considering for the same semiprime m>=k, and adding the difference also to the sequence if >=0 and if different from the previous swapped case. - _R. J. Mathar_, May 06 2010 %e A176887 a(1)=0 because prime(1)*1-prime(1)*1=2-2=0; a(2)=1 because prime(1)*2-prime(2)*1=4-3=1. %Y A176887 Cf. A001358. %K A176887 nonn,less %O A176887 1,7 %A A176887 _Juri-Stepan Gerasimov_, Apr 28 2010 %E A176887 a(25), a(43), a(44) and maybe others corrected by _R. J. Mathar_, May 06 2010 %E A176887 New name from _Pontus von Brömssen_ and _Charles R Greathouse IV_, Apr 18 2022