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Problems

Number theory
Difficulty
Sort by
5
Two factors
Medium
14
The Ticket Chase
Very easy
27
Cycle shifts
Easy
33
The favourite numbers of Santa Claus
Easy
43
Competitors’ quantity of olimpia
Very easy
97
Bell numbers
Very easy
114
Escape from Prison
Hard
123
Number of zeroes in factorial
Very easy
135
LCM
Medium
137
GCD
Very easy
163
Happy Numbers
Hard
249
The Very Hard One
Easy
311
Maximum quantity of figures
Very easy
321
Binomial coefficients 4
Medium
338
My favorite, irreducible...
Easy
339
Again irreducible
Very easy
367
RSA Factorization
Very easy
414
Equation
Very easy
427
Assessment
Very easy
442
Constructions
Very easy
484
Линейный чёрный ящик
Hard
561
Interesting equation
Very hard
563
Simple equation
Very easy
571
The greatest common divisor
Very easy
572
The Lesson of mathematics
Very easy
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