Английская Википедия:241 (number)
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Шаблон:About Шаблон:For Шаблон:Refimprove Шаблон:Infobox number 241 (two hundred [and] forty-one) is the natural number between 240 and 242. It is also a prime number.
241 is the larger of the twin primes (239, 241). Twin primes are pairs of primes separated by 2.
241 is a regular prime[1] and a lucky prime.[2]
Since 241 = 15 × 24 + 1, it is a Proth prime.
241 is a repdigit in base 15 (111).
241 is the only known Lucas–Wieferich prime to (U, V) = (3, −1).
References
Шаблон:Reflist Шаблон:Integers