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 A277533 #4 Oct 24 2016 04:33:09 %S A277533 5,77,777,0,0,333333 %N A277533 Value of decimal number corresponding to the string of equal digits starting at position A277532(n) after the decimal point in the decimal expansion of the Euler-Mascheroni constant. %F A277533 a(n) = A001620(A277532(n)) * A002275(n). %o A277533 (PARI) emstring(n) = default(realprecision, n+10); my(x=Euler); floor(x*10^n) %o A277533 emdigit(n) = emstring(n)-10*emstring(n-1) %o A277533 searchstrval(n) = my(x=1, i=1); while(1, my(y=x+1); while(emdigit(y)==emdigit(x), y++; i++); if(i >= n, return(emdigit(x)*(10^n-1)/9)); i=1; x++) %o A277533 a(n) = searchstrval(n) %Y A277533 Cf. A001620, A049522, A244601, A244602, A277259, A277260, A277532. %K A277533 nonn,base,more %O A277533 1,1 %A A277533 _Felix Fröhlich_, Oct 19 2016