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Old 2019-04-30, 12:27   #3
robert44444uk
 
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Jun 2003
Oxford, UK

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Here's an interesting fact, looking at quads, (i.e. two sets of twins in a space of 9), the difference between two sets of quads must be a multiple of 30. However, differences cannot be 30*x, when x= 2mod7 or 5mod7, for some reason that a mod specialist will be able to explain.

The run of quads in the range 5 to 1e9 produces x of values between 1 to 13184.
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