Školjka Registration
What is Školjka?
Školjka is a web archive of math problems, a tool intended for primary and high school students training for math contests. It contains thousands of problems from various math contests in recent two decades.
Why Školjka?
Školjka supports searching by categories and difficulty, allowing students to quickly find the exact problems they are interested in. Likewise, Školjka can be helpful to mentors and teachers for preparing lectures.
Selected competitions
Recently added tasks
uzastopnih znamenaka jednako je jedinica i nula, a među bilo koje 
uzastopne znamenke broj se jedinica i broj nula razlikuju. Koja je najveća moguća duljina takvoga niza? 6 months, 1 week
, pri čemu je 
prost, a 
prirodan broj za koje vrijedi 
6 months, 1 week
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