falagar

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2,111 reputation

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bio	website	spbtc.ru
	location	St. Petersburg, Russia
	age	27
visits	member for	2 years, 10 months
	seen	Apr 21 at 7:57
stats	profile views	146

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28 Answers

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21	Prove that $\sum_{k=1}^{n-1}\tan^{2}\frac{k \pi}{2n} = \frac{(n-1)(2n-1)}{3}$
20	If $AB = I$ then $BA = I$
14	How are we able to calculate specific numbers in the Fibonacci Sequence?
13	Last digits of primes
12	Sets of integers in which every element is the sum of two others

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2,111 Reputation

+30	How are we able to calculate specific numbers in the Fibonacci Sequence?
+10	Prove that $\sum_{k=1}^{n-1}\tan^{2}\frac{k \pi}{2n} = \frac{(n-1)(2n-1)}{3}$
+10	Find all $x$ for that $x^2 + (x+1)^2$ is a square
+10	If $AB = I$ then $BA = I$

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3 Questions

votes activity newest

4	Tetrahedron volume
4	Counting primes
3	Nonprimes with $3^{n-1} \equiv 2^{n-1} \pmod n$

35 Tags

41 linear-algebra × 4	18 combinatorics × 3
38 number-theory × 7	17 geometry × 6
24 trigonometry × 2	16 prime-numbers × 3
21 matrices × 2	14 fibonacci-numbers × 2
19 algebra-precalculus × 3	14 generating-functions

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