Approximations of reals by prime ratios
117132
Rationals of the form $\frac{p}{q}$ where $p,q$ are primes in $[a,b]$
75011
Primes of the form $n^2+1$ - hard?
51059
Real-world applications of prime numbers?
66216
Squares, Cubes and Prime numbers
45850
Prime elements in the gaussian integers
133617
Relatively prime property verification
73515
Primes Number Theory
14240
Approximating next prime number
119486
Upper and Lower bounds on the nth prime number
132140
Convergence of Sequence of Real Numbers
55509
Factor a polynomial over the reals
36485
$H_n(X,A) \not \approx \tilde{H}_n(X/A)$
117366
Is there a simple, constructive, 1-1 mapping between the reals and the irrationals?
152976
Real Analysis: open and closed sets
114442
Completion of rational numbers via Cauchy sequences
20135
Measure of  reals in $[0,1]$ which don't have $4$ in decimal expansion
134539
Euclidean and induction with prime numbers