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A145681 Numbers m such that A034448(m) = 3m/2, where A034448 = unitary sigma = sum of divisors d with gcd(d,m/d)=1. 1

%I

%S 2,20,24,360,816,1056,12240,15840,29120,181632,2724480,9192960,

%T 13790400,15288000,93358848,199180800,1130734080,1400382720,

%U 25115166720,544161945600,3089165506560,11519246340096,172788695101440,274358081249280,5944425093734400,33746043993661440,7425442423511040000,25976914334122752000000,48787315395486187520000,56897897650906642513920

%N Numbers m such that A034448(m) = 3m/2, where A034448 = unitary sigma = sum of divisors d with gcd(d,m/d)=1.

%C 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 Y. Kohmoto, <a href="http://list.seqfan.eu/pipermail/seqfan/2014-January/012386.html">Unitary RMPN</a>, SeqFan list, Jan. 2014

%Y Cf. A034448.

%K nonn

%O 1,1

%A _Yasutoshi Kohmoto_ Mar 09 2009

%E Corrected and extended by _Jack Brennen_, Jan 30 2014

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Last modified August 10 02:02 EDT 2020. Contains 336365 sequences. (Running on oeis4.)