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 A181704 #11 Jul 16 2022 11:54:58
%S A181704 12,88,1888,32128,521728,8378368,34359083008,549753192448,
%T A181704 2251799645913088,9223372026117357568,2361183241263023915008,
%U A181704 2596148429267413634121263069790208,2722258935367507707522529418717050175488
%N A181704 Numbers m=2^(t-1)*(2^t-5), where 2^t-5 is prime.
%C A181704 All these numbers are in A181595 because their abundance is 4, a proper divisor of m.
%t A181704 Rest[2^(#-1) (2^#-5)&/@(Round[N[Log[#+5]/Log[2]]]&/@Select[Table[2^t-5,{t,120}],PrimeQ])] (* _Harvey P. Dale_, Dec 16 2010 *)
%Y A181704 Cf. A059608, A156560, A181595, A181701, A000396, A181703, A045769
%K A181704 nonn
%O A181704 1,1
%A A181704 _Vladimir Shevelev_, Nov 06 2010
%E A181704 571728 replaced with 521728 by _R. J. Mathar_, Dec 05 2010