32 What is the mathematical notation for rounding a given number to the nearest integer? 27 Elementary proof of Zsigmondy's theorem 23 Why shouldn't this prove the prime number theorem? 17 Can second degree polynomials generate as many as we wish prime numbers in the way described? 16 Name for a function whose effect is canceled by another function?

### Reputation (16,011)

 +20 Possible progress on the Riemann hypothesis? +5 An ideal of a quadratic order times its conjugate, is it principal? +100 What is the mathematical notation for rounding a given number to the nearest integer? +10 Isotropy of ternary quadratic forms over global fields

### Questions (87)

 31 Trigonometric diophantine equation $8\sin^2\left(\frac{(k+1)\pi}{n}\right)=n\sin\left(\frac{2\pi}{n}\right)$ 27 Elementary proof of Zsigmondy's theorem 20 Counting binary sequences with no more than $2$ equal consecutive numbers 19 Proving that $\gcd(2^m - 1, 2^n - 1) = 2^{\gcd(m,n )} - 1$ 13 Closed form for $\sum_{k=1}^\infty(\zeta(4k+1)-1)$

### Tags (295)

 297 number-theory × 134 72 combinatorics × 28 281 elementary-number-theory × 128 71 abstract-algebra × 44 148 prime-numbers × 54 64 sequences-and-series × 28 81 divisibility × 28 64 analytic-number-theory × 21 72 diophantine-equations × 41 56 inequality × 30

### Account (1)

 Mathematics 16,011 rep 33 gold badges3131 silver badges9292 bronze badges