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elementary-number-theory

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Answers (164)

Votes Activity Newest

18	Is there a prime every year if YYYYMMDD is treated as a base-$10$ number?
12	Is this sequence based on the Fibonacci numbers a prime generator?
9	I heard there are 48 regular polyhedrons. With what Jan Misali calls regular polyhedrons, are there any more?
9	Formula for the area of a rhombus
9	Find the smallest integer $n>1$ such that $\frac{1}{n}\left(1+2^2+3^2+\ldots+n^2\right)$ is a perfect square

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Reputation (4,291)

+10	For which regular $n$-gons are there two sides/diagonals with a rational ratio other than $1$?
+10	Name and meaning of 'mod' or 'remainder' operation in mathematics
+25	Proving $2+2^2/2+2^3/3+2^4/4+\cdots=0$ elementarily
+10	I heard there are 48 regular polyhedrons. With what Jan Misali calls regular polyhedrons, are there any more?

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Questions (13)

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20	Why is $!n\pmod{n+k}$ a multiple of $k+1$ so often?
10	What are the main ideas needed to prove that only $92$ Johnson solids exist?
3	What is the complete classification of the uniform tesselations?
3	Descartes-like formula in 4D
3	When can a regular simplex be inscribed in a regular hypercube?

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Tags (149)

96 elementary-number-theory × 35	33 divisibility × 7
63 number-theory × 19	30 sequences-and-series × 13
49 combinatorics × 26	28 diophantine-equations × 5
44 geometry × 15	25 recreational-mathematics × 4
34 prime-numbers × 7	23 euclidean-geometry × 4

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Bookmarks (61)

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215	Is there an elementary proof that $\sum \limits_{k=1}^n \frac1k$ is never an integer?
163	Is $2048$ the highest power of $2$ with all even digits (base ten)?
147	Is there a quick proof as to why the vector space of $\mathbb{R}$ over $\mathbb{Q}$ is infinite-dimensional?
54	Is OEIS A248049 an integer sequence?
43	Mathematics for the afterlife

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	TeX - LaTeX	123 rep	5 bronze badges
	Stack Overflow	107 rep	7 bronze badges
	MathOverflow	101 rep	3 bronze badges

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