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  1. def f(n,A=[],l=0):l=l or len(`n`)/2;return-(n in A)or-~f(n*n/10**l%100**l,A+[n],l)
  2.  
  3. for n in 24, 82, 123456, 8989, 789987:
  4. 	print '%6d: %d' % (n, f(n))
Success #stdin #stdout 0.01s 9072KB
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stdin
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Standard input is empty
stdout
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    24: 1
    82: 5
123456: 146
  8989: 68
789987: 226
https://ideone.com/FC1SfF
language:
Python (cpython 2.7.16)
created:
8 years ago
visibility:
secret

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