Minimizing Fibb |
Not your business |
Odd divisors |

Numbers ratio |
Temirlan's cake |
Divisibility by 4 |

Convex triangle |
Powers of 6 |
Random answer |

C Sum |
Squared fours |
One three-digit number |

Friendly rooks |
Area of triangle |
Square multiples of 24 |

Sum of digits 2020 |
2+1 |
All such |

Tommorow's day |
Test |
Cubical squares |

Sum of four |
Exactly two roots |
Tricky polynomial |

Sequenta |
Function |
Special square |

Bingo! |
Math lesson |
Arithmetic derivative |

Again these rooks |
5th power equation |
More dominos |

Switchers |
Small triangular numbers |
Relatively prime with 2020 |

Weird equation |
Oh-matrix |
Many digits |

Just sequence |
Positive product of sums |
Almost squared numbers |

NRD pair |
Expanding brackets |
U turn |

2020 Palindromes |
6 Apart |
Money date |

2020 digit |
Diameter |
Equilateral Triangles |

Angle chasing |
Four on a circle |
5 instead of 1 |

Viet said |
Bools and cows |
Tricky |

Triangle in hyperbola |
VNT |
Point O |

What a function |
Fill the square |
Prime powers |

Product of differences |
Odd polynomial |
Tricky sequence |