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 A088234 #5 Jul 10 2020 13:04:02
%S A088234 1,0,1,-1,0,2,-1,-1,0,3,-3,0,0,1,1,-2,0,4,-4,0,0,0,1,-1,0,0,5,-5,0,0,
%T A088234 0,3,-3,0,0,0,0,0,0,0,1,1,-2,6,-6,0,0,0,0,0,0,0,1,-1,0,0,0,0,0,0,0,0,
%U A088234 0,0,0,0,0,4,-4,7,-7,0,0,0,0,0,0,1,-1,0,0,0,0,0,0,2,-2,0,0,0,1,-1,0,0
%N A088234 First differences of exponents of consecutive prime powers.
%C A088234 a(n) = A025474(n+1) - A025474(n).
%t A088234 Join[{1},Differences[FactorInteger[#][[1,2]]&/@Select[Range[ 400], PrimePowerQ]]] (* _Harvey P. Dale_, Jul 10 2020 *)
%Y A088234 Cf. A088233, A000961, A057820.
%K A088234 sign
%O A088234 1,6
%A A088234 _Reinhard Zumkeller_, Sep 25 2003