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Task/Proper-divisors/D/proper-divisors.d
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Task/Proper-divisors/D/proper-divisors.d
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void main() /*@safe*/ {
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import std.stdio, std.algorithm, std.range, std.typecons;
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immutable properDivs = (in uint n) pure nothrow @safe /*@nogc*/ =>
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iota(1, (n + 1) / 2 + 1).filter!(x => n % x == 0 && n != x);
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iota(1, 11).map!properDivs.writeln;
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iota(1, 20_001).map!(n => tuple(properDivs(n).count, n)).reduce!max.writeln;
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}
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