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The 1979 Series (Posted on 2013-08-27) Difficulty: 2 of 5
In the sequence 19796..., each digit after 6 is the sum, mod 10, of the preceding four digits. Show that ...1979... turns up again in the sequence, but that ...1980... never occurs at all.

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
Solutioncomputer solutionCharlie2013-08-27 18:07:02
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