What is a composite number between 70 and 80?

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All gum save ##{71,73,79}## are composite gum betwixt 70 and 80 i.e.

##{70,72,74,75,76,77,78,80}## are composite gum.

All gum which are not are composite gum.

To experience whether a enumerate is consummate enumerate or not one wants to try dividing the enumerate merely by consummate gum up to almost of this enumerate.

As we feel to furnish composite gum betwixt ##70## and ##80##, we want to stop for consummate gum up to ##9## (as ##9^2=81##) i.e. ##{2,3,5,7}## merely.

These gum do not bisect ##{71,73,79}## and hence other than these,cherishing gum are composite.

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