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 A076344 #5 Mar 30 2012 18:50:26 %S A076344 0,-2,-8,2,-2,0,-12,-2,8,2,-16,2,4,-2,-8,-2,-16,-12,8,-24,2,-2,16,-28, %T A076344 2,-20,2,20,-2,-24,-4,-36,-2,16,2,-32,20,-2,-8,-24,2,-36,-48,-28,-2, %U A076344 -52,-2,0,32,2,28,-2,-48,-32,-2,24,-64,2,-56,40,-4,2,-72,2,-20,44,-2,-32,-76,-2 %N A076344 A076341(A001358(n)), imaginary part of semiprimes mapped as defined in A076340, A076341. %e A076344 Applying the map as defined in A076340, A076341: %e A076344 A001358(15)=39=3*13=(4-1)*(12+1) -> (4,-1)*(12,1) = (4*12+1,4-12) = (49,-8), therefore a(15)=-8 and A076343(15)=49. %Y A076344 Real part = A076343, A070750, A076348. %K A076344 sign %O A076344 1,2 %A A076344 _Reinhard Zumkeller_, Oct 08 2002