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How many of the numbers in the following list can be simplified? $$\sqrt2,\sqrt3,\sqrt4,\ldots,\sqrt{100}$$ For example, $\sqrt{45}=3\sqrt5$ can be simplified, but $\sqrt{30}$ cannot.

 Jul 17, 2016
 #1
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-2

\sqrt4=2

\sqrt100=10

 Aug 4, 2016
 #2
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+2

@above a LOT more can be simplified, including \sqrt9=3 and \sqrt16=4...etc

I'm also working on this problem, so this will also be a sort of notepad for me

\sqrt4=2

\sqrt8=2\sqrt2

\sqrt9=3

\sqrt12=2\sqrt3

\sqrt16=4

\sqrt18=3\sqrt2

\sqrt20=2\sqrt5

\sqrt24=2\sqrt6

\sqrt25=5

\sqrt27=3\sqrt3

\sqrt28=2\sqrt7

\sqrt32=4\sqrt2

\sqrt36=6

\sqrt40=2\sqrt10

\sqrt44=2\sqrt11

\sqrt45=3\sqrt5

\sqrt48=4\sqrt3

\sqrt49=7

\sqrt50=5\sqrt2

\sqrt52=2\sqrt13

\sqrt54=3\sqrt6

\sqrt56=2\sqrt14

\sqrt60=2sqrt15

\sqrt63=3\sqrt7

\sqrt64=8

\sqrt68=2\sqrt17

\sqrt72=6\sqrt2

\sqrt75=5\sqrt3

\sqrt76=2\sqrt19

\sqrt80=4\sqrt10

\sqrt81=9

\sqrt84=2\sqrt21

\sqrt88=2\sqrt22

\sqrt90=3\sqrt10

\sqrt92=2\sqrt23

\sqrt96=2\sqrt24

\sqrt98=7\sqrt2

\sqrt99=3\sqrt11

\sqrt100=10

I think this is completely exhaustive, because I went from numbers divisible by 4(2^2) to divisible by 9(3^2) to divisible by 25(5^2)(I skip 16 because it is 2^4 and so included already) to divisible by 49(7^2)(I skip 36 because it is (3*2)^2 and so included already) to divisible by 64(8^2), 81(9^2), and 100(10^2).

Total of 39.

 Aug 16, 2016

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