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 A281532 #15 Jan 25 2017 08:43:06 %S A281532 1,2,5,18,118 %N A281532 a(n) = least numerator X such that the proper fraction X/A281529(n) needs n or more terms to be written as a signed sum of distinct unit fractions. %C A281532 Sierpiński conjectured that for any integer n > 3 there exist positive integers a, b, c so that 5/n = 1/a + 1/b + 1/c. If the conjecture is true, then 5 appears only once in the sequence. %D A281532 W. Sierpiński, O rozkładach liczb wymiernych na ułamki proste, PWN, Warsaw, Poland, 1957, pp. 96-100. %Y A281532 See A281529 for denominators. %K A281532 nonn,frac,hard,more %O A281532 1,2 %A A281532 _Arkadiusz Wesolowski_, Jan 23 2017