← Roadmapsall math & number theory problems
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Math & Number Theory

Digits, primes, GCD/LCM, combinatorics.

4 subtopics · 88 problems0/64 on the path solved
next ▸ Palindrome Numbermachine 1050
01

Digits & bases

0/16 of 29

Reverse, palindrome, add digits, roman, base.

○Palindrome NumberSilver · 1050○Harshad NumberSilver · 1050○Add Digits (Digital Root)Silver · 1080○Add Digits To RootSilver · 1100○Convert to Base 7Silver · 1100○Sum of Digits of a Harshad NumberSilver · 1100○Count Digits That DivideSilver · 1100○Reverse IntegerSilver · 1200○Count Digits That Divide a NumberSilver · 1200○Alternating Digit SumSilver · 1250○Count DigitsGold · 1300○Excel Column To NumberGold · 1300○Base 7Gold · 1300○Add DigitsGold · 1300○Number To Excel ColumnGold · 1350○Self Dividing NumbersGold · 1350+ 13 more in the arena →
02

Primes & factors

0/16 of 24

Count primes, ugly, perfect, happy numbers.

○Coprime CheckSilver · 1000○Is PrimeSilver · 1100○Perfect Number CheckSilver · 1100○Ugly NumberSilver · 1120○Nth Prime NumberSilver · 1200○Smallest Prime FactorSilver · 1200○Happy NumberGold · 1300○Ugly Number CheckGold · 1300○Prime FactorizationGold · 1300○Perfect NumberGold · 1310○Count Primes Below NGold · 1350○Trailing Zeroes in FactorialGold · 1350○Factorial Trailing ZerosGold · 1350○Count Primes in a RangeGold · 1350○Count PrimesGold · 1400○Count Coprime PairsGold · 1400+ 8 more in the arena →
03

GCD/LCM & power

0/16 of 18

GCD, LCM, sqrt, pow, fast exponentiation.

○Greatest Common DivisorSilver · 1050○Valid Perfect SquareSilver · 1050○Power of ThreeSilver · 1050○Least Common MultipleSilver · 1150○GCD of an ArraySilver · 1150○GCD of Two NumbersSilver · 1200○Power FunctionGold · 1300○GCD Of ArrayGold · 1300○LCM of Two NumbersGold · 1300○Integer PowerGold · 1350○Sum Of Digit PowersGold · 1350○Pow(x, n)Gold · 1400○Pow(x, n) IntegerGold · 1410○Divide Without DivisionGold · 1550○Extended Euclidean AlgorithmGold · 1550○Divide Two IntegersGold · 1550+ 2 more in the arena →
04

Counting & sums

0/16 of 17

FizzBuzz, multiples, candies, triangle.

○FizzBuzz ArraySilver · 1000○Nim Game WinnerSilver · 1050○Fizz BuzzSilver · 1050○Bulb SwitcherSilver · 1100○Minimum Time To Visit PointsSilver · 1100○Arranging CoinsSilver · 1150○Bulb Switcher CountSilver · 1250○Minimum Moves to Equal ArrayGold · 1300○Three Consecutive Integers Summing to a NumberGold · 1300○Sum of MultiplesGold · 1350○Nth Digit of the SequenceGold · 1400○Distribute Candies to PeopleGold · 1400○Water and Jug ProblemGold · 1450○Nth Digit of ConcatenationGold · 1450○Nth DigitGold · 1480○Minimum Area RectanglePlatinum · 1700+ 1 more in the arena →