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EulerSpoiler
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An even number is perfect if, and only if, its cototient is equal to the square of the largest power of 2 contained in it.

I also have the username Hexagon Tiling.

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Top posts
All Questions Answers
Score Newest
question
4
What is the grammatical role of the last line of Gray's 'Elegy'?
Oct 28
question
2
Is there a term for words or expressions that have meaning in both directions?
Jun 25, 2019
answer
1
Is there an idiom for "people are the same everywhere"?
Jan 12, 2020
question
0
What does 'haply' mean in Keats's 'Ode to a Nightingale'?
Nov 20
answer
0
What is the name for this dichotomy between rapid feedback vs whole-system in thinking/problem solving styles?
Jul 25, 2020
answer
0
I can run faster than _____. (1) him (2) he?
Dec 17, 2021
question
-1
What does 'pards' mean in Keats's 'Ode to a Nightingale'?
Nov 19
answer
-3
Word for "when someone does something good for you and then mentions it persistently afterwards"
Mar 15, 2021

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