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 A143350 #2 Mar 30 2012 17:25:31 %S A143350 2,4,-1,7,-1,-1,10,-2,-1,0,15,-2,-1,0,-1,18,-3,-2,0,-1,1,23,-3,-2,0, %T A143350 -1,1,-1,26,-4,-2,0,-1,1,-1,0,31,-4,-3,0,-1,1,-1,0,0,38,-5,-3,0,-2,1, %U A143350 -1,0,0,1,41,-5,-3,0,-2,1,-1,0,0,1,-1,48,-6,-4,0,-2,2,-1,0,0,1,-1,0,53,-6,-4,0,-2,2,-1,0,0,1,-1,0,-1,56,-7,-4,0,-2,2,-2,0,0 %N A143350 Triangle read by rows, replace column 1 of triangle A143349 with A095116, 1<=k<=n. %C A143350 Triangle A143349 = a type of Mobius transform which converts sequences to triangles with row sums = the same sequence. In this case, we convert p(n) to triangle A143349 having row sums = p(n), the primes. %C A143350 We begin with p(n), adding (n-1) = A095116: (2, 4, 7, 10, 15, 18, 23,...). We then replace column 1 of triangle A143349 with A095116 resulting in A143350 with row sums = p(n). %F A143350 Triangle read by rows, replace column 1 of triangle A143349 with A095116, 1<=k<=n. A143349 = p(n)+(n-1) & A143349 = a type of Mobius transform. %e A143350 First few rows of the triangle = %e A143350 2; %e A143350 4, -1; %e A143350 7, -1, -1; %e A143350 10, -2, -1, 0; %e A143350 15, -2, -1, 0, -1; %e A143350 18, -3, -2, 0, -1, 1; %e A143350 23, -3, -2, 0, -1, 1, -1; %e A143350 26, -4, -2, 0, -1, 1, -1, 0; %e A143350 31, -4, -3, 0, -1, 1, -1, 0, 0; %e A143350 38, -5, -3, 0, -2, 1, -1, 0, 0, 1; %e A143350 ... %Y A143350 Cf. A143349, A095116, A008683, A000040. %K A143350 tabl,sign %O A143350 1,1 %A A143350 _Gary W. Adamson_, Aug 10 2008