Crib! I haven't played in decades. The number 19 comes to mind, but it was so long ago.
not played for awhile but it is 19
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Numbers that cannot be expressed in the form of a ratio of two integers.
No. Prime numbers cannot be composite and composite numbers cannot be prime!
You cannot, unless there are very few numbers in the series.You cannot, unless there are very few numbers in the series.You cannot, unless there are very few numbers in the series.You cannot, unless there are very few numbers in the series.
No, numbers cannot be both.
Numbers which are a power of 2 (1,2,4,8,16,32,64,...) cannot be made by summing consecutive numbers.