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%I #11 Mar 06 2015 23:08:00
%S 0,1,3,3,4,9,9,10,9,9,10,12,12,13,27,27,28,27,27,28,30,30,31,27,27,28,
%T 27,27,28,30,30,31,36,36,37,36,36,37,39,39,40,81,81,82,81,81,82,84,84,
%U 85,81,81,82,81,81,82,84,84,85,90,90,91,90,90,91,93,93,94,81,81,82,81
%N p(n), positive part of n when n=p(n)-q(n) with p(n), q(n), p(n)+q(n) in A005836, integers written without 2 in base 3.
%C The graphs of p(n), q(n) are fractals; the graph of p(n)+q(n) is Sierpiński-like.
%H Reinhard Zumkeller, <a href="/A060372/b060372.txt">Table of n, a(n) for n = 0..10000</a>
%e Example: 14=27-13=3^3 -(3^0+3^1+3^2), 16=28-12=3^3+3^0 -(3^1+3^2), 20=30-10=3^3+3^1 -(3^0+3^2); 27+13=28+12=30+10=40; 10,12,13, 27, 28, 30 are written without 2 in base 3.
%o (Haskell)
%o a060372 n = (a060374 n + n) `div` 2 -- _Reinhard Zumkeller_, Jun 09 2012
%Y Cf. A005836, A060373, A060374.
%K easy,nice,nonn
%O 0,3
%A Claude Lenormand (claude.lenormand(AT)free.fr), Apr 02 2001
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