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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Duffinian-numbers/Mathematica/duffinian-numbers.math Normal file
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ClearAll[DuffianQ]
DuffianQ[n_Integer] := CompositeQ[n] \[And] CoprimeQ[DivisorSigma[1, n], n]
dns = Select[DuffianQ][Range[1000000]];
Take[dns, UpTo[50]]
triplets = ToString[dns[[#]]] <> "\[LongDash]" <> ToString[dns[[# + 2]]] & /@ SequencePosition[Differences[dns], {1, 1}][[All, 1]]
Multicolumn[triplets, {Automatic, 5}, Appearance -> "Horizontal"]