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 A259953 #28 Jul 15 2015 18:02:44 %S A259953 504,2394,5544,10584,12600,21600,26880,35712,133920,138240,139104, %T A259953 157248,168480,224640,245520,262080,294840,311040,348192,357120, %U A259953 388800,399168,645624,698544,749952,756000,892800,955206,1017792,1048320,1270080,1296000,1296000,1315440,1347840,1451520,1522800,1666560,1781136,1879200,2041200 %N A259953 The sum (in nondecreasing order) of the two numbers in an amicable pair. %C A259953 Also the common value of sigma(x) = sigma(y) of the amicable pairs (x < y) ordered by nondecreasing sum (x + y). See A259933. %C A259953 Duplicates occur, e.g., a(32) = a(33) = 1296000. %C A259953 Another version of A180164. %C A259953 First differs from both A161005 and A180164 at a(9). %F A259953 a(n) = A259933(2n-1) + A259933(2n) = A260086(n) + A260087(n). %e A259953 ------------------------------------------ %e A259953 A m i c a b l e p a i r Sum %e A259953 ------------------------------------------ %e A259953 n A260086(n) + A260087(n) = a(n) %e A259953 ------------------------------------------ %e A259953 1 220 284 504 %e A259953 2 1184 1210 2394 %e A259953 3 2620 2924 5544 %e A259953 4 5020 5564 10584 %e A259953 5 6232 6368 12600 %e A259953 6 10744 10856 21600 %e A259953 7 12285 14595 26880 %e A259953 8 17296 18416 35712 %e A259953 9 66928 66992 133920 %e A259953 10 67095 71145 138240 %e A259953 11 63020 76084 139104 %e A259953 12 69615 87633 157248 %e A259953 ... ... ... ... %e A259953 32 609928 686072 1296000 %e A259953 33 643336 652664 1296000 %e A259953 ... %Y A259953 Cf. A000203, A063990, A161005, A180164, A259180, A259933, A260086, A260087. %K A259953 nonn %O A259953 1,1 %A A259953 _Omar E. Pol_, Jul 10 2015