18 lines
404 B
Ruby
18 lines
404 B
Ruby
@memo = [0,1]
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def happy(n)
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sum = n.digits.sum{|n| n*n}
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return @memo[sum] if @memo[sum]==0 or @memo[sum]==1
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@memo[sum] = 0 # for the cycle check
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@memo[sum] = happy(sum) # return 1:Happy number, 0:other
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end
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i = count = 0
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while count < 8
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i += 1
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puts i or count+=1 if happy(i)==1
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end
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puts
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for i in 99999999999900..99999999999999
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puts i if happy(i)==1
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end
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