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 A145681 #13 Dec 23 2024 14:53:42 %S A145681 2,20,24,360,816,1056,12240,15840,29120,181632,2724480,9192960, %T A145681 13790400,15288000,93358848,199180800,1130734080,1400382720, %U A145681 25115166720,544161945600,3089165506560,11519246340096,172788695101440,274358081249280,5944425093734400,33746043993661440,7425442423511040000,25976914334122752000000,48787315395486187520000,56897897650906642513920 %N A145681 Numbers m such that A034448(m) = 3m/2, where A034448 = unitary sigma = sum of divisors d with gcd(d,m/d)=1. %C A145681 See also A144672, A144673 and A144674. These three and the present one all differ only by one or two terms around a(11)-a(12). More explanations would be welcome. - _M. F. Hasler_, Jan 29 2014 %H A145681 Y. Kohmoto, <a href="https://web.archive.org/web/*/http://list.seqfan.eu/oldermail/seqfan/2014-January/012386.html">Unitary RMPN</a>, SeqFan list, Jan. 2014 %Y A145681 Cf. A034448. %K A145681 nonn %O A145681 1,1 %A A145681 _Yasutoshi Kohmoto_ Mar 09 2009 %E A145681 Corrected and extended by _Jack Brennen_, Jan 30 2014