15 lines
402 B
Plaintext
15 lines
402 B
Plaintext
func is_arithmetic(n) {
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n.tau `divides` n.sigma
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}
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say "The first one hundred arithmetic numbers:"
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100.by(is_arithmetic).each_slice(10, {|*a|
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a.map { '%3s' % _ }.join(' ').say
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})
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for x in (1e3, 1e4, 1e5, 1e6) {
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var arr = x.by(is_arithmetic)
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say "\n#{x}th arithmetic number is #{arr.last}."
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say "There are #{arr.count{.is_composite}} composite arithmetic numbers <= #{arr.last}."
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}
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