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what is the 444th term of the series $1,2,3,10,11,12,13,20,21,22,23,30,31, \dots$

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    One resource that comes often useful in these cases is The On-Line Encyclopedia of Integer Sequences http://oeis.org/2013-02-01
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    In this particular case, http://www.cleavebooks.co.uk/scol/calnumba.htm may also be useful.2013-02-01

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