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A050679
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Positions of 2's in A048288.
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4
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Range[2, 12], PrimeOmega[FromDigits[Flatten[IntegerDigits[Range[#, 1, -1]]]]]==2 &] (* Jayanta Basu, May 30 2013 *)
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CROSSREFS
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KEYWORD
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nonn,base,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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