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Countdown from 100 to 0

The Penguin said:
73 and now let's finish the rest
Click to expand...

73 seventy-three
Penguin said 73.

The next number down
Is up to me.

What to do?
What to do?

Number-72.png
 
Sixty-five is the 23rd semi prime and the 3rd of the form (5.q)it is an octagonal number. It is also a Cullen number. Given 65, the Mertens function returns 0.
 
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