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A116169
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Numbers k such that k concatenated with k+1 gives the product of two numbers which differ by 9.
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8
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OFFSET
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1,1
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COMMENTS
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Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 7.
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LINKS
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EXAMPLE
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49//50 = 66 * 75, where // denotes concatenation.
49//58 = 67 * 74.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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