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A282631
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The smallest square referenced in A237043 (Numbers n such that 2^n - 1 is not squarefree, but 2^d - 1 is squarefree for every proper divisor d of n.).
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2
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9, 25, 49, 121, 289, 961, 529, 1194649, 1849, 5329, 841, 16129, 7921, 2209
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OFFSET
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1,1
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LINKS
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EXAMPLE
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A273043(1)=6, 2^6-1=63, 63=3*3*7, 63 is not squarefree and the square is 3*3=9.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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