# SUUGAKU — Explore the beauty of math

> Explore the beauty of math (iPhone/iPad app by Fuji Bit Inc..)

- Source: https://appshunter.io/ios/app/suugaku/id6759102221 (this page in markdown: same URL + `.md`)
- Developer: [Fuji Bit Inc.](https://appshunter.io/developer/1874205957)
- Category: Education, Entertainment
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: Japanese
- Released: 2026-03-28
- Data updated: 2026-06-30
- User reviews in markdown: https://appshunter.io/ios/app/suugaku/id6759102221/reviews.md

## What is SUUGAKU?

SUUGAKU is an interactive app that lets you experience the beauty of mathematics firsthand.

Featuring 12 mathematical themes, explore the fascinating properties of numbers through animations and graphs. The HOME screen organizes themes into 4 horizontal-tab categories (Primes & Divisors, Digit Magic, Iterative Wonders, Sequences & Shapes) for natural discovery. Whether you're a math beginner or a number theory enthusiast, everyone can enjoy the elegance of numbers.

[THEMES]

- Kaprekar Numbers
Repeatedly sort and subtract digits of 3- or 4-digit numbers to watch them converge to Kaprekar constants (495 / 6174). Experience this mysterious phenomenon with step-by-step animation.

- Collatz Sequence
"If even, divide by 2; if odd, multiply by 3 and add 1" — one of math's great unsolved problems. Visualize the sequence trajectory with a line graph and observe how every number reaches 1.

- Perfect & Amicable Numbers
6, 28, 496... Check and search for perfect numbers whose divisor sums equal themselves. Also discover amicable number pairs where each number's divisor sum equals the other.

- Prime Numbers
Primality testing, prime factorization, Sieve of Eratosthenes, twin primes, and Mersenne primes — dive deep into the world of primes.

- Fibonacci Sequence
0, 1, 1, 2, 3, 5, 8, 13... The beautiful sequence found throughout nature. Calculate the Nth number, check if a number is Fibonacci, and view the sequence graph.

- Harshad Numbers
Numbers divisible by the sum of their digits. Discover this hidden property of everyday numbers through checking and listing.

- Magic Squares
Auto-generate mystical N×N arrangements where every row, column, and diagonal sums to the same value. Watch cells appear one by one in a satisfying animation.

- Goldbach's Conjecture
Verify the unsolved conjecture that "every even integer >= 4 is the sum of two primes." Decompose even numbers into prime pairs and view decomposition counts.

- Smith Numbers
Composite numbers whose digit sum equals the sum of digits of their prime factorization. For example, 22 = 2×11 -> digit sum 2+2=4, factor digit sum 2+1+1=4. Check and list these fascinating numbers.

- Happy Numbers
Repeatedly sum the squares of a number's digits — if it reaches 1, it's happy! For example, 19 -> 1²+9²=82 -> 8²+2²=68 -> ... -> 1. Follow the step-by-step journey to see if your number is happy or enters a loop.

- Palindrome Numbers
Numbers that read the same forwards and backwards (e.g. 121, 1331, 12321). The Reverse-and-Add mode iteratively reverses a number and adds it to the original, animating up to 30 steps to see if a palindrome is reached. Explore Lychrel candidates like 196 — numbers that may never converge.

- Pythagorean Triples [NEW]
Integer triples (a, b, c) satisfying a² + b² = c², such as (3, 4, 5) and (5, 12, 13). Check any triple and visualize the right triangle with a gradient fill. Find out whether it is a primitive triple (gcd(a, b, c) = 1). The primitives list mode uses Euclid's formula to enumerate all primitive triples up to your specified bound.

[FEATURES]
- HOME screen with 4 horizontal-tab categories for easy navigation
- Dark mode / Light mode toggle
- Japanese / English bilingual support
- Smooth performance with background processing for heavy calculations
- Intuitive UI — anyone can start using it immediately
- Optimized for iPhone and iPad

Experience the "motion" and "beauty" of numbers that textbooks can't convey.


## Version history (last 5 releases)

### 6.2 — 2026-06-05

- Redesigned HOME screen — a top "Recommended" row plus 2-column category grids for easier browsing
- Cards now use a theme-color gradient background with a larger centered icon
- New modes are highlighted with a "NEW" badge

### 6.1 — 2026-05-22

- Redesigned HOME screen — 4 categories stacked vertically, each with a horizontal-scroll row of cards so all themes are visible at a glance
- Cards now show an icon, title, and short description for instant theme recognition
- New layout stays compact as more modes are added, eliminating long vertical scrolls

### 6.0.1 — 2026-05-20

- Fixed an issue where some tab bar icons were clipped at the bottom
- Improved the copyright footer placement so it sits correctly just above the tab bar

### 5.1 — 2026-04-28

We have fixed the bug.

### 4.0 — 2026-04-01

• New mode: Smith Numbers — check and list composite numbers whose digit sum matches their prime factor digit sum
• New mode: Happy Numbers — check if repeatedly squaring and summing digits reaches 1, with step-by-step visualization
• Now 10 themes in total

## More apps by Fuji Bit Inc.

- [BUTURAKU](https://appshunter.io/ios/app/buturaku/id6759213255)
- [PAKEDOU](https://appshunter.io/ios/app/pakedou/id6759820254)
- [OKURERUNA！](https://appshunter.io/ios/app/okureruna/id6759956971)
- [HARAKU](https://appshunter.io/ios/app/haraku/id6759958253)
- [KORAKU](https://appshunter.io/ios/app/koraku/id6760215571)

All apps by Fuji Bit Inc.: https://appshunter.io/developer/1874205957

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-30.*