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 A279860 #33 Apr 07 2025 20:54:20 %S A279860 2,18,182,1828,98793,987931,4349076,82549802,450388721,5291493974, %T A279860 72883660263,476539957100,2557556217677,45820090256930, %U A279860 441340408673681,4413404086736815,4490816865108378,44908168651083787,3369635849169468729,29845348176416445308,561387588857094780748,8238609087161769234440 %N A279860 a(n) is the first n-digit substring to repeat in the decimal expansion of e. %C A279860 The first two occurrences of a(4) = 1828 appear consecutively as 18281828. %e A279860 a(2) = 18 because 18 is the first 2-digit number to repeat in the decimal expansion of e = 2.7(18)28(18)... %e A279860 2 appears at positions 0 and 4. %e A279860 18 appears at positions 2 and 6. %e A279860 182 appears at positions 2 and 6. %e A279860 1828 appears at positions 2 and 6. %e A279860 98793 appears at positions 478 and 494. %e A279860 987931 appears at positions 478 and 494. %e A279860 4349076 appears at positions 170 and 2731. %e A279860 ... %Y A279860 Cf. A001113, A197123. %K A279860 nonn,base %O A279860 1,1 %A A279860 _Bobby Jacobs_, Dec 20 2016 %E A279860 a(8)-a(12) from _Alois P. Heinz_, Dec 21 2016 %E A279860 a(13)-a(22) from _Dominik Winecki_, Apr 07 2025