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 A141554 #4 Mar 30 2012 18:52:27 %S A141554 0,4,0,12,8,20,15,0,12,24,25,36,16,21,44,15,40,36,0,45,60,35,24,68,55, %T A141554 48,60,72,45,84,32,45,60,75,88,36,63,80,85,108,72,116,75,0,77,108,120, %U A141554 105,100,48,140,75,136,81,132,96,45,156,120,105,164,135,144,108,99,168 %N A141554 Transformed nonprime products of prime factors of the composites, the largest prime decremented by 2 and the smallest prime incremented by 2. %C A141554 In the prime number decomposition of k=A002808(i), i=1,2,3,.., one instance of the largest prime, pmax=A052369(i), is replaced by pmax-2 and one instance of the smallest prime, pmin=A056608(i), is replaced by pmin+2. If the product of this modified list of factors, k*(pmax-2)*(pmin+2)/(pmin*pmax), is nonprime, it is added to the sequence. %e A141554 k(1)=4=(p(max)=2)*(p(min)=2), transformed (2-2)*(2+2)=0*4=0=a(1). %e A141554 k(2)=6=(p(max)=3)*(p(min)=2), transformed (3-2)*(2+2)=1*4=4=a(2). %e A141554 k(3)=8=(p(max)=2)*(p=2)*(p(min)=2), transformed (2-2)*2*(2+2)=0*2*4=0=a(3). %e A141554 k(4)=9=(p(max)=3)*(p(min)=3), transformed (3-2)*(3+2)=1*5=5 (prime, skipped). %e A141554 k(5)=10=(p(max)=5)*(p(min)=2), transformed (5-2)*(2+2)=3*4=12=a(4). %Y A141554 Cf. A141218, A141219, A141220, A141284. %K A141554 nonn %O A141554 1,2 %A A141554 _Juri-Stepan Gerasimov_, Aug 14 2008 %E A141554 Edited and corrected by _R. J. Mathar_, Aug 18 2008