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 A329109 #17 Nov 06 2019 19:14:02 %S A329109 13,77,104,158,259,350,397,1095,1213,1453,1687,1924,2079,2169,2426, %T A329109 2427,2557,2794,2797,3517,3653,3733,4081,4441,4803,5077,5423,5437, %U A329109 6037,6083,6133,6638,7323,7933,8127,9268,9393 %N A329109 Numbers k such that 1/k and 1/(k+1) have repeating non-terminating decimal representations with the same length. %C A329109 These are numbers k such that A051626(k) = A051626(k+1) > 0. %e A329109 1/13 and 1/14 both repeat with period 6, so 13 is in the sequence. %Y A329109 Cf. A051626. %K A329109 nonn,base %O A329109 1,1 %A A329109 _Jud McCranie_, Nov 04 2019