Mersenne Primes vs Sutra

Prime numbers are fundamentally important in mathematics and they are also very beautiful numbers. The largest known prime number we know now is 2^77232917-1 and it is a Mersenne Prime (a prime number of the form Mn = 2^n − 1 for some integer n which is also a prime number). The current largest Mersenne Prime number M77232917 (found in 2017 by GIMPS - Great Internet Mersenne Prime Search) has 23,249,425 digits. There is no website that can show you all the digits in a webpage because it is too huge. This app will generate and show you all digits of all known Mersenne Primes. You can also have close look of every digit page by page. The digits will be generated by your mobile phone's CPU and saved to your storage card. You will witness the whole process of the generation for the big ones (i.e. M77232917 , M74207281, M57885161, M43112609, M42643801, M37156667, ...), because it might need one day or two to print the digits all. You can also locate a digit by its sequence number. e.g. the 23249268th digit of M77232917 is 8.

Sutra — A pocket Tripitaka. An offline, distraction-free reader for the Chinese-Buddhist canon, with text sourced from CBETA (Chinese Buddhist Electronic Texts Association, latest open release), grounded in the Taishō Tripitaka. Translations by Kumārajīva, Xuanzang, Yijing and others — organized for daily reading. ■ 35 scriptures The Dharma-Drum daily-recital selection: Heart Sutra, Diamond Sutra, Amitābha Sutra, Universal Gate of Avalokiteśvara, Samantabhadra's Vows, 42 Sections, Medicine Buddha, Earth Treasury, Śūraṅgama, Perfect Enlightenment … Four major repentance liturgies: Liang Emperor, Threefold Samādhi Water, Great Compassion, Earth Treasury Jeweled, 88 Buddhas, Ten Small Mantras. Oldest-stratum short collections: Dhammapada, Aṭṭhakavagga, Itivuttaka, Saṃyukta-āgama selections (including Pabhassara Sutta, Mahāparinibbāna verse). ■ Four-language parallel reading Four core scriptures carry four reading modes: 　Chinese — Classical Chinese translation (Xuanzang, Kumārajīva …) 　Sanskrit — IAST + Devanāgarī, the original sound 　English — translation, opening the meaning 　English→Chinese — modern Mandarin transcribed from the English An in-app "Reading Languages" essay explains why each mode exists. ■ Traditional vertical ↔ modern horizontal One tap to switch. Vertical preserves the handwritten-sutra ritual feel; horizontal suits commuting and night reading. Four font sizes (S/M/L/XL); the size stays put when TTS playback is on. ■ Cinnabar-stamp aesthetic, sprinkled-gold paper Visual identity drawn from Song-Yuan sutra manuscripts: cream cotton-paper texture in light mode, royal navy with sprinkled gold in dark mode. Restrained palette designed to be easy on the eyes during long readings. ■ Recitation TTS Built-in Mandarin voices (Tingting / Meijia / Sinji) read along with you — useful when driving or eyes closed. ■ Six reflective essays 　• Textual Strata — what layer of "the Buddha's word" we are reading 　• Three Buddhas — the three shapes the Buddha takes in text 　• Path of Deification — the five stages from man to god 　• "Are all sentient beings originally Buddha?" — tracing the lineage of a Chan koan 　• Reading Languages — positioning the four modes 　• Sources & Attribution — CBETA license + acknowledgements ■ Reminders Daily passage push at 06:00; 16 major Buddhist holidays (Buddha's bath day, Avalokiteśvara's anniversary, Earth-Treasury Bodhisattva's anniversary …) push at 09:00. Optional integration with the system Reminders app. ■ Privacy Zero data collection. No tracking, no analytics, no upload. The sutra database ships with the app; your reading progress and bookmarks stay on your device. No ads, no IAP, no subscription, free forever. — Sutra text © CBETA (Chinese Buddhist Electronic Texts Association), latest open release. Base: Taishō Tripitaka © Daizo Shuppan K.K. (CBETA holds input and publication permissions). License: CC BY-NC-SA 3.0 Taiwan — https://www.cbeta.org/copyright.php This app is non-commercial. Sutra texts are unaltered in substance, with CBETA attribution and version noted.