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 A180277 #15 Jul 29 2024 09:59:27
%S A180277 240,2400,40320,72576,94080,120960,141120,311040,403200,483840,483840,
%T A180277 725760,673920,1010880,1209600,1497600,1411200,1612800,1747200,
%U A180277 2246400,2177280,2371200,2449440,2419200,2620800,2903040,3144960,3110400
%N A180277 a(n) = A002952(n) + A002953(n).
%H A180277 Amiram Eldar, <a href="/A180277/b180277.txt">Table of n, a(n) for n = 1..7896</a>
%F A180277 a(n) = A002952(n) + A002953(n).
%F A180277 {(j+k) such that sigma*(j) = sigma*(k) = j+k, where sigma*(n) is the unitary divisor function A034448}.
%e A180277 a(1) = 114 + 126 = 240 = 2^4 * 3 * 5.
%e A180277 a(2) = 1140 + 1260 = 2400 = 2^5 * 3 * 5^2.
%e A180277 a(10) = a(11) - why?
%Y A180277 Cf. A002952, A002953, A161005, A180163.
%K A180277 nonn,less
%O A180277 1,1
%A A180277 _Jonathan Vos Post_, Aug 23 2010
%E A180277 Extended by _R. J. Mathar_, Aug 26 2010
%E A180277 Shorter name using given formula from _Joerg Arndt_, Jul 29 2024