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%I A282519 #20 Dec 20 2018 08:48:20
%S A282519 2,9,18,24,60,88,625,1089,2601,1500625
%N A282519 Refactorable numbers that are the sum of two refactorable numbers in exactly one way.
%C A282519 Sequence is a result of investigation on the marked region in graph of A172398(A033950(n)) that is in Links section. Also there are other sequences that marked region has.
%H A282519 Altug Alkan, <a href="/A282519/a282519.png">Illustration of A172398(A033950(n))</a>
%H A282519 S. Colton, <a href="https://cs.uwaterloo.ca/journals/JIS/colton/joisol.html">Refactorable Numbers - A Machine Invention</a>, J. Integer Sequences, Vol. 2, 1999.
%H A282519 Joshua Zelinsky, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL5/Zelinsky/zelinsky9.html">Tau Numbers: A Partial Proof of a Conjecture and Other Results </a>, Journal of Integer Sequences, Vol. 5 (2002), Article 02.2.8
%e A282519 Refactorable number 1500625 is a term because 1500625 is the sum of two refactorable numbers in exactly one way, that is, 1500625 = 5^4 * 7^4 = 3^2 * 131^2 + 2^7 * 13 * 809.
%Y A282519 Cf. A033950, A172398, A280634, A281663.
%K A282519 nonn,more
%O A282519 1,1
%A A282519 _Altug Alkan_, Feb 17 2017
%E A282519 a(10) from _Giovanni Resta_, Feb 17 2017

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