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 A259039 #15 Sep 28 2018 05:48:51 %S A259039 56,248,328,496,1016,2032,6462,8128,17412,20538,65528,131056,524224, %T A259039 1048568,2097136,2096896,4194296,8388592,8388544,33554368,33554176, %U A259039 134217472,2147467264,8589918208 %N A259039 Larger of a non-unitary amicable pair. %C A259039 The elements 2097136, 8388592, etc. are intentionally out of numerical order so that a(n) and A259038(n) form an amicable pair. %Y A259039 Cf. A034448, A259037, A259038. %K A259039 nonn,more %O A259039 1,1 %A A259039 _Mauro Fiorentini_, Jun 17 2015 %E A259039 a(23)-a(24) added by _Amiram Eldar_, Sep 27 2018 from the b-file at A259037.