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%I #3 Mar 31 2012 13:46:52
%S 11,21,22,31,32,42,43,51,53,62,64,72,74,83,85,91,95,131,612,1614,1712,
%T 1714,1813,1815,1911,1915,2113,2116,2122,2126,2134,2137,2142,2147,
%U 2154,2158,2163,2168,2175,2179,2181,2189,2195,2211,3113,3211,4116,4211,4212
%N Erase the odd-indexed digits of the sequence and concatenate what is left. The result is the concatenation of all integers of the sequence.
%C Fractal slowest increasing such sequence.
%e Sequence : 11,21,22,31,32,42,43,51,53,62,64,72,74,83,...
%e To erase :.*..*..*..*..*..*..*..*..*..*..*..*..*..*...
%e To keep .:..1..1..2..1..2..2..3..1..3..2..4..2..4..3...
%e leaving .:...11,...21,...22,...31,...32,...42,...43...
%e so when you concatenate all "kept digits" you get the concatenation of all integers of the original sequence.
%K base,easy,nonn
%O 0,1
%A _Eric Angelini_, Jun 17 2005
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