SUUGAKU - Enjoy Numbers

SUUGAKU lets you discover the wonders of numbers with your own hands. Enter any number and watch the calculation unfold through animations and graphs. Whether math is hard for you or number theory is your passion, there is something to enjoy. [14 THEMES] - Kaprekar Numbers Sort digits and subtract, again and again, and watch numbers converge to 495 or 6174, step by step. - Collatz Sequence If even, divide by 2. If odd, multiply by 3 and add 1. See the path of this unsolved conjecture on a graph. - Perfect & Amicable Numbers Find numbers like 6, 28 and 496 whose divisors sum to themselves, and pairs whose divisors sum to each other. - Prime Numbers Try primality checks, factorization, the Sieve of Eratosthenes, twin primes and Mersenne primes. - Fibonacci Sequence Compute the Nth number, check any number, and explore the list and graph of this sequence found in nature. - Harshad Numbers Check and list numbers divisible by the sum of their digits. - Magic Squares Generate odd-order squares with equal rows, columns and diagonals, in animation. - Goldbach's Conjecture Split even numbers of 4 or more into two primes and count the pairs. - Smith Numbers Find composite numbers whose digit sum equals the digit sum of their prime factors. - Happy Numbers Sum the squares of the digits again and again, and see step by step whether you reach 1. - Palindrome Numbers Check numbers that read the same both ways, and try the reverse-and-add puzzle of 196. - Pythagorean Triples Check triples with a² + b² = c², see the right triangle, and list the primitive triples. - Triangular Numbers (new) Arrange dots into a triangle to see n(n+1)/2 for yourself, then check and list them. - Narcissistic Numbers (new) Find numbers like 153 = 1³ + 5³ + 3³, equal to the sum of their digits raised to the number of digits. [FEATURES] - Dark and light themes - All calculations run on your device - No account needed - Available in many languages This app shows ads.