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A179895 a(n) = smallest number m such that m^2 has exactly n decimal digits n. 2

%I #2 Mar 30 2012 17:26:35

%S 1,1,15,586,212,22485,68313,278874,623609,3082207

%N a(n) = smallest number m such that m^2 has exactly n decimal digits n.

%e a(0)=1 because 1^1=1 has zero 0's

%e a(1)=1 because 1^1=1 has one 1's

%e a(8)=623609 because 623609^2=388888184881 has eight 8's

%e a(9)=3082207 because3082207^2=9499999990849 has nine 9's.

%Y Cf. A086935

%K base,fini,full,nonn

%O 0,3

%A _Zak Seidov_, Jul 31 2010

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Last modified April 20 17:12 EDT 2024. Contains 371845 sequences. (Running on oeis4.)