6 lines
352 B
Text
6 lines
352 B
Text
ClearAll[DuffianQ]
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DuffianQ[n_Integer] := CompositeQ[n] \[And] CoprimeQ[DivisorSigma[1, n], n]
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dns = Select[DuffianQ][Range[1000000]];
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Take[dns, UpTo[50]]
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triplets = ToString[dns[[#]]] <> "\[LongDash]" <> ToString[dns[[# + 2]]] & /@ SequencePosition[Differences[dns], {1, 1}][[All, 1]]
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Multicolumn[triplets, {Automatic, 5}, Appearance -> "Horizontal"]
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