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 A302937 #10 May 04 2018 08:46:52 %S A302937 2,4,0,1,9,3,4,7,2,7,1,3,5,4,0,4,0,2,9,0,7,6,5,9,9,0,1,6,5,3,6,1,9,4, %T A302937 3,8,8,0,4,8,6,9,9,0,4,0,2,1,9,5,4,7,6,0,5,7,1,4,1,4,2,4,6,1,1,2,5,6, %U A302937 7,5,3,0,8,5,7,8,9,9,3,9,6,7,0,7,4,4,3,5,3,6,8,9,7,2,0,5,4,0,4,0,4,9,9,4,4 %N A302937 Decimal expansion of continued fraction 1/(4+1/(6+1/(8+1/(9+1/(10+...))))). %C A302937 Decimal expansion of the constant whose continued fraction form is the sequence of all the composite numbers. %e A302937 0.24019347271354040290765990165361943880486990402195476057141424611256753... %p A302937 with(numtheory); P:=proc(q) local a,n; a:=0; for n from q by -1 to 4 do if not isprime(n) then a:=1/(a+n); fi; od; print(evalf(a,120)); end: P(10^4); %t A302937 RealDigits[ Fold[1/(#1 + #2) &, 1, Reverse[ Composite@# & /@ Range@40]], 10, 111][[1]] (* _Robert G. Wilson v_, Apr 29 2018 *) %Y A302937 Cf. A002808, A084255. %K A302937 nonn,easy,cons %O A302937 0,1 %A A302937 _Paolo P. Lava_, Apr 16 2018