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A175733
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a(n) = the smallest n-digit number with 3 divisors.
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6
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4, 25, 121, 1369, 10201, 100489, 1018081, 10004569, 100140049, 1000267129, 10000600009, 100008370081, 1000006000009, 10000033772089, 100000380000361, 1000000025191729, 10000001400000049, 100000000621806289, 1000000014000000049, 10000000055856073561
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..20.
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FORMULA
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a(n) = A131581(n-1)^2.
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MATHEMATICA
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Table[Prime[1 + PrimePi[Sqrt[10^n]]]^2, {n, 0, 25}] (* T. D. Noe, Aug 19 2011 *)
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CROSSREFS
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Cf. A131581, A132153, A136582, A175734.
Sequence in context: A069639 A013582 A260373 * A240479 A317949 A263440
Adjacent sequences: A175730 A175731 A175732 * A175734 A175735 A175736
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KEYWORD
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nonn,base
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AUTHOR
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Jaroslav Krizek, Aug 24 2010
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STATUS
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approved
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