self Maths Puzzle

What do the following numbers have in common ?
3 - 7 - 10 - 17 - 11 - 12 - 73 - 77

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self Other Question

Use four 5s and some of the symbols +,x,- and / to give expressions for 0,1,2 and 5 ? Of all straight lines drawn through a point of intersection of two circles and terminated by the circumferences, the maximum is that which is parallel to the line joining the two centres---Prove it.