How many primes are there on the form $100\cdots 0 1$?
45461
Is there a prime which is the form of $10^n + 1$ except $2, 11, 101$?
13260
Choosing $101$ numbers from $\{1, 2, \dots , 200\}$.
114542
Can a number with $100$ $0$'s $100$ $1$'s and $100$ $2$'s ever be a perfect square?
2593
Proof for Mersenne primes?
136947
Simple Mersenne prime divisibility proofs
73515
Primes Number Theory
60706
Proof that there are infinitely many prime numbers starting with a given digit string
72666
Prime Numbers And Perfect Squares
78044
Sieve of eratosthenes infinite primes
139776
Divisibility tests and remainder mod $9,11,99,101,999,1001\,$ (casting out nines and elevens)
24008
Infinitely many primes of the form $\lfloor \sqrt {3} \cdot n \rfloor $?
76282
Prime number expressible as $2^2+3^3+5^5+7^7+11^{11}+\cdots$
53967
distribution of prime numbers
23932
Why do repunit primes have only a prime number of consecutive $1$s?
35821
Infinitely many primes for quadratic residues
151036
arithmetic progression of primes
84591
What are the limits of the Prime-functions?