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%I A062070 #19 May 24 2021 00:56:49
%S A062070 2,2,0,0,2,0,0,0,0,2,4,3,2,6,5,4,3,2,8,7,2,4,7,3,6,2,5,9,4,8,3,5,0,2,
%T A062070 4,0,10,3,0,9,4,2,0,0,3,5,0,0,2,4,5,3,0,0,9,4,2,0,0,8,6,4,0,13,2,0,5,
%U A062070 3,0,12,7,5,2,0,3,0,0,6,4,13,2,3,0,0,4,0,0,0,7,2,4,7,0,0,5,0,0,2,0,3,2
%N A062070 Smallest base b such that the decimal digits of n interpreted as digits in base b give a square, or 0 if no such base exists.
%H A062070 Felix Fröhlich, <a href="/A062070/b062070.txt">Table of n, a(n) for n = 0..10000</a>
%e A062070 a(13) = 6 since 13_6 = 9 = 3^2 and this is the smallest such base.
%o A062070 (PARI) a(n) = {for (b=2, n+2, if (issquare(fromdigits(digits(n), b)), return (b));); return (0);} \\ _Michel Marcus_, Nov 20 2017
%K A062070 base,easy,nice,nonn
%O A062070 0,1
%A A062070 _Erich Friedman_, Jun 27 2001
%E A062070 Name clarified by _Felix Fröhlich_ and _Kevin Ryde_, May 17 2021

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