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A104760
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Smallest semiprime containing exactly n 7's.
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2
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57, 77, 3777, 17777, 277777, 1777777, 17777777, 707777777, 3777777777, 17777777777, 577777777777, 1777777777777, 37777777777777, 757777777777777, 4777777777777777, 37777777777777777, 277777777777777777
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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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a(2)=77 because 77 is the smallest semiprime containing exactly two 7's.
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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