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Sep
13
awarded  Nice Question
Sep
13
comment Show that 2n “1” digits subtract n “2” digits is a perfect square.
@celtschk Ah, okay. Yep. I understand.
Sep
13
comment Show that 2n “1” digits subtract n “2” digits is a perfect square.
@leemes Right, but we haven't shown that 10^{n} - 1 is perfectly divisible by 3.
Sep
13
accepted Show that 2n “1” digits subtract n “2” digits is a perfect square.
Sep
13
comment Show that 2n “1” digits subtract n “2” digits is a perfect square.
Awesome! Then I should be able to prove by induction that $10^{n} - 1$ is divisible by 3. Thanks! (will accept your answer in 8 mins... sorry, don't have much rep over here on the Math version of Stack Overflow :p)
Sep
13
revised Show that 2n “1” digits subtract n “2” digits is a perfect square.
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Sep
13
asked Show that 2n “1” digits subtract n “2” digits is a perfect square.
Nov
4
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Mar
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May
17
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May
17
comment Can somebody simply explain Wilson's theorem (for a 13 year old)
thank you this is a very valuable answer...
May
17
accepted Can somebody simply explain Wilson's theorem (for a 13 year old)
May
17
revised Can somebody simply explain Wilson's theorem (for a 13 year old)
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May
17
comment Can somebody simply explain Wilson's theorem (for a 13 year old)
Ok, Im still kind of stuck. If n is 4, (4-1)! would be 6. 6/1 works, 6/2 works, 6/3 works, but 6/4 doesn't work.... but 4 isn't prime.... and for if n was 5, (5-1)! would be 24. 24/1 works, 24/2 works, 24/3 works, 24/4 works, 24/5 however doesn't work... and that is prime... So I'm a bit muddled up
May
17
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May
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May
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May
17
revised Can somebody simply explain Wilson's theorem (for a 13 year old)
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May
17
comment Can somebody simply explain Wilson's theorem (for a 13 year old)
ok ill try that, but can you answer my question please?
May
17
comment Can somebody simply explain Wilson's theorem (for a 13 year old)
can you answer my previous question? yes, i read that. I understand what it means, just not how it applies to this situation and how it can help prove whether a number is prime or not – Rohan Kapur 18 mins ago