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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Arithmetic-Rational/Julia/arithmetic-rational.julia Normal file
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using Primes
divisors(n) = foldl((a, (p, e)) -> vcat((a * [p^i for i in 0:e]')...), factor(n), init=[1])
isperfect(n) = sum(1 // d for d in divisors(n)) == 2
lo, hi = 2, 2^19
println("Perfect numbers between ", lo, " and ", hi, ": ", collect(filter(isperfect, lo:hi)))