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 A282783 #8 Feb 28 2017 22:57:52
%S A282783 0,1,1,6,77,1069,13041,153389,1691609,18175623,192338138
%N A282783 Number of terms in A282430 less than or equal to 10^n.
%C A282783 An approximate value of a(n) is given by C*10^n*(exp(-2) - 1/log(10^n)), where C = 0.209.
%o A282783 (PARI) a(n)={t=0; forstep(m=2, 10^n, 2, if(!(m%3)==0, x=0; until(p<2||isprime(p), p=m-3^x; x++); if(p<2, t++))); return(t)};
%Y A282783 Cf. A282430.
%K A282783 nonn,more
%O A282783 0,4
%A A282783 _Arkadiusz Wesolowski_, Feb 21 2017