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@hyuki0000
Created September 17, 2017 10:07
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小さい方からn個選んだ素数の平均が素数になることはn=1以外にあるかな?
require 'prime'
MAX = 10000_00000_00000
n = Rational(0)
s = Rational(0)
Prime.each(MAX) do |p|
n += 1
s += p
if (s/n).denominator == 1
puts "f(#{n}) = #{s/n} : INTEGER"
if Prime.prime?((s/n).to_i)
puts "f(#{n}) = #{s/n} : PRIME"
end
end
if n % 100000 == 0
print "(#{n})\r"
end
end
@hyuki0000
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この話題のツイートはこちらからたどれます
https://twitter.com/hyuki/status/909338738202775554

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