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 A125492 #26 Jul 02 2016 01:59:36 %S A125492 2556,11556,27312,32136,42168,41952,41412,54870,55890,57834,54516, %T A125492 70110,75540,83772,88480,84348,84504,83538,102258,100890,100656, %U A125492 108324,138828,132792,132396,143370,146268,168150,162384,189948 %N A125492 Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives z numbers. %C A125492 _Giovanni Resta_ computed the first 12 terms. %C A125492 As stated, we first order by common sigma value. When the common value of sigma is the same for several triples, these are then sorted (ascending) by the smallest member. When the smallest members also agree, we go on to the second smallest members, and so on, lexicographically. - _John Cerkan_, Jun 18 2016 %H A125492 John Cerkan, <a href="/A125492/b125492.txt">Table of n, a(n) for n = 1..10000</a> [Terms 1 through 1000 were computed by Donovan Johnson] %e A125492 2556 is in the sequence since sigma(1980) = sigma(2016) = sigma(2556) = 6552 = 1980 + 2016 + 2556. - _Michael B. Porter_, Jun 29 2016 %Y A125492 Cf. A125490, A125491, A137231 (x+y+z). %Y A125492 Cf. A000203 (sigma function). %K A125492 nonn %O A125492 1,1 %A A125492 _Yasutoshi Kohmoto_, Dec 11 2006 %E A125492 a(1)-a(12) from _Giovanni Resta_ %E A125492 Definition corrected by _N. J. A. Sloane_, Nov 27 2008 %E A125492 a(13)-a(30) from _Donovan Johnson_, Apr 14 2010