Finding all numbers smaller than $2040$ so that $51 | 71n-24$
30045
Solving linear congruences by hand: modular fractions and inverses
18795
Find the Smallest Integer Not in a List
99890
Primes with digits only 1
59357
How many numbers are in the Fibonacci sequence below a given threshold?
138271
Find the least number which when divided by 2, 3, 4, 5, 6 leaves a remainder of 1 but it is divided by 7 completely.
144767
Picking integers satisfying a limit
37051
Choosing numbers without consecutive numbers.
69222
Find XOR of all numbers in a given range
78188
How can I get the smallest possible answer with the Chinese Remainder Theorem?
116822
Finding the next rational number
48908
Choose 100 numbers from 1~200 (one less than 16) - prove one is divisible by another!
112599
What is the smallest value of n such that an algorithm running at 100*n^2 operates faster than 2^n ? [How to figure out without brute force]
107008
Find the remainder when $45!$ is divided by $47$?
29238
Making Change for a Dollar (and other number partitioning problems)
16699
Find the smallest numbers in the second column corresponding to index values in first column
149961
Two digit numbers
47109
Generate an integer that is not among four billion given ones