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Jul
19
revised Ten chairs arranged in a circle
added 78 characters in body
Jul
19
comment Ten chairs arranged in a circle
yes, you are 100% correct. Thank you very much for noticing this, I have updated the answer, did I understand you correctly?
Jul
19
comment Modulus and Fermat's Little Theorem
fermat will not work, fermat's theorem is just the simple observation that the order of any element $\mathbb Z_p$ is a divisor of $p-1$. This cannot be improved at all, in fact, in this case the order of $11$ is precisely $162$, so there is nothing to be done.
Jul
19
comment How many integer numbers on the interval $[1,10^n]$ have a digit $0$ on its usual decimal representation
Yeah, I think it is good now, although question asks for the numbers that do have a zero.
Jul
19
comment How many integer numbers on the interval $[1,10^n]$ have a digit $0$ on its usual decimal representation
I think you made some mistakes in the formula.
Jul
19
answered How many integer numbers on the interval $[1,10^n]$ have a digit $0$ on its usual decimal representation
Jul
19
comment Modulus and Fermat's Little Theorem
it's a joke.${}{}{}{}$
Jul
19
answered Modulus and Fermat's Little Theorem
Jul
19
answered Show that $4$ does not divide $x^3-2$
Jul
19
revised Ten chairs arranged in a circle
added 9 characters in body
Jul
19
answered Ten chairs arranged in a circle
Jul
19
comment Ten chairs arranged in a circle
You're supposed to find recurrence relations.
Jul
19
comment Ten chairs arranged in a circle
For example a subset of $1$ element is not taken into account.
Jul
19
comment Ten chairs arranged in a circle
you seem to only be counting subsets of a certain size.
Jul
19
comment Sum of inverse of Fermat's numbers
I'm almost 100% sure we are not able to relate it to any known constants with our current knowleadge.
Jul
19
answered Find all the answers to this equation
Jul
19
reviewed Approve Find all the answers to this equation
Jul
19
comment condition for a group to be abelian
lol, this is a cool problem btw.
Jul
19
comment Why the length of the zigzag curve approximating the circle does not approach the length of the circle?
there are continuous functions that are nowhere differentiable.
Jul
19
comment Why the length of the zigzag curve approximating the circle does not approach the length of the circle?
what derivatives?