# PrimeCalc - mod,prime factor — record the formula and results

> record the formula and results (iPhone/iPad app by Yutaka Nakao.)

- Source: https://appshunter.io/ios/app/primecalc-modprime-factor/id1332239791 (this page in markdown: same URL + `.md`)
- Developer: [Yutaka Nakao](https://appshunter.io/developer/1303008060)
- Category: Utilities, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 12.0 · 12 MB
- Languages: American English
- Released: 2018-01-08
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/primecalc-modprime-factor/id1332239791/reviews.md

## What is PrimeCalc?

--- PrimeCalc feature　---
■ Normal arithmetic operation (×, /, +, -) is available.

■ prime: integer calculation
(Division remainder ÷, prime factorization p) can be done.
(You can also exponentiate.)

■ auto: Automatic calculation, memory storage, history recording is possible.

■ global: Digit display of countries around the world is possible.
（千、万、億、兆、京、垓、・・・）

■ iPhone / iPad is available. Free.
We are displaying advertisements.

Caution) In case of large number, calculation error etc. may occur. Please use it together with other calculator.

If you have comments, questions, etc., please email or bulletin board.

http: //www.eonet.ne.jp/~treechart/


## Version history (last 5 releases)

### 3.3 — 2023-09-29

Text is now easier to read even in dark mode.

### 3.2 — 2023-02-02

Since we use Google Ads and Firebase, we have updated the APP privacy.

### 3.1 — 2023-01-28

Text area can't edit.

### 3.0 — 2023-01-28

thank you for using.
Reduced history area and font.

### 2.2 — 2019-10-14

Thank you for your use.
change ad display.
you use this app smoothly.

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## More apps by Yutaka Nakao

- [TreeChart - easy mindmap](https://appshunter.io/ios/app/treechart-easy-mindmap/id1303008061)
- [FlexMemo - 拡大・縮小が自由自在なメモ帳](https://appshunter.io/ios/app/flexmemo/id1395286149)
- [ShogiShoot - To master shogi](https://appshunter.io/ios/app/shogishoot-to-master-shogi/id1423621072)
- [EasyImageFilter - one touch](https://appshunter.io/ios/app/easyimagefilter-one-touch/id1439433942)
- [Siwake  - 家計簿感覚で仕訳が身につく](https://appshunter.io/ios/app/siwake/id1483948412)

All apps by Yutaka Nakao: https://appshunter.io/developer/1303008060

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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 2026-05-17.*