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%I #6 Sep 20 2012 17:13:30
%S 1,1212,123123123,1234123412341234,12345123451234512345,
%T 123456123456123456123456123456123456,
%U 1234567123456712345671234567123456712345671234567
%N a(n) = n concatenations of numbers from 1 to n, concatenated.
%D F. Smarandache, "Properties of the numbers", Univ. of Craiova Archives, 1975; Arizona State University Special Collections, Tempe, AZ.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SmarandacheSequences.html">Smarandache Sequences</a>.
%Y Cf. A098129, A000461.
%K easy,nonn,base
%O 1,2
%A _Alexandre Wajnberg_, Apr 25 2005
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