count to a million

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CityAsylum
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10 May 2008, 5:24 pm

4514

JerryHatake
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10 May 2008, 5:28 pm

4515

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richie
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10 May 2008, 6:10 pm

4516=1129x2²

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Rainbow-Squirrel
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11 May 2008, 9:21 am

4517

TallyMan
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11 May 2008, 9:42 am

4518

Rainbow-Squirrel
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11 May 2008, 10:10 am

4519

TallyMan
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11 May 2008, 10:13 am

4520

Tim_Tex
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11 May 2008, 12:12 pm

4521

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Who’s better at math than a robot? They’re made of math!

JerryHatake
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11 May 2008, 12:14 pm

4522

TallyMan
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11 May 2008, 12:15 pm

4523

Tim_Tex
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11 May 2008, 12:17 pm

4524

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Who’s better at math than a robot? They’re made of math!

TallyMan
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11 May 2008, 12:18 pm

4525

richie
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11 May 2008, 12:44 pm

4526=73x31x2

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JerryHatake
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11 May 2008, 12:49 pm

4527

TallyMan
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11 May 2008, 12:50 pm

4527 (Richie, I've got to ask - do you factorise the numbers in your head, on paper or with a computer? )

richie
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11 May 2008, 1:18 pm

4528=283x2²x2²

Some numbers I can factor mentally such as 4527....the digits add up to 18 so I know your number
is a multiple of nine...from there I use the windows calculator and then I look up the primes at either
the Prime Curios page or the AT&T Online Encyclopedia of Integer Sequences.
The even numbers I keep dividing by 2 until I come to an odd then I test for primality...
4527=503x3x3...

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