Fractions |
Product of differences |
Odd divisors |

Squared fours |
One three-digit number |
Irreducible Fractions |

Square multiples of 24 |
Five Primes |
Divisibility by 4 |

Relatively prime with 2020 |
Triangle in Hexagon |
Tommorow's day |

Cubical squares |
Oh-matrix |
Test |

2020 digit |
Sum of four |
Numbers ratio |

Money date |
Zeros and Ones |
Viet said |

Bools and cows |
Convex triangle |
Quadratic |

2020 Palindromes |
Weird equation |
Friendly rooks |

Sum of Digits |
Sum of digits 2020 |
Lin does shopping |

Area of triangle |
Random answer |
Parking |

Lin's Octagon |
Digital Cubes |
Lucky numbers |

Regular Polygons |
Temirlan's cake |
6-sums |

Just Easy Sum |
Odd polynomial |
NRD pair |

2+1 |
Angle chasing |
Equilateral Triangles |

Small triangular numbers |
Bingo! |
Not your business |

Concetric |
5 instead of 1 |
Factorial Factor |

C Sum |
Triangle and Square |
Seven eleven |