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9^a(n) is smallest power of 9 containing the string 'n'.
2

%I #3 Mar 30 2012 17:30:32

%S 5,0,3,6,5,4,4,3,2,1,11,15,18,11,6,18,17,19,13,23,9,8,14,21,12,13,26,

%T 28,12,3,8,6,13,24,10,18,12,27,9,27,10,6,9,8,6,14,8,7,9,5,18,16,18,6,

%U 13,35,4,20,13,5,11,4,23,18,12,4,17,8,24,7,22,17,3,26,9,30

%N 9^a(n) is smallest power of 9 containing the string 'n'.

%C Table[k = 0; While[ StringPosition[ ToString[9^k], ToString[n] ] == {}, k++ ]; k, {n, 0, 75} ]

%Y Cf. A030000.

%K base,nonn

%O 0,1

%A _Robert G. Wilson v_, Jun 24 2001