241 (number)

← 240 241 242 →
← 240 241 242 243 244 245 246 247 248 249 → List of numbers ; Integers ; ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred forty-one
Ordinal	241st; (two hundred forty-first)
Factorization	prime
Prime	twin prime
Greek numeral	ΣΜΑ´
Roman numeral	CCXLI, ccxli
Binary	111100012
Ternary	222213
Senary	10416
Octal	3618
Duodecimal	18112
Hexadecimal	F116

Last updated April 26, 2025

241 (two hundred [and] forty-one) is the natural number between 240 and 242. It is also a prime number.

In mathematics

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. ^[3]
241 is a repdigit in base 15 (111).
241 is the only known Lucas–Wieferich prime to (U, V) = (3, −1).

References

↑ "Sloane's A007703 : Regular primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
↑ "Sloane's A031157 : Numbers that are both lucky and prime". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
↑ Sloane, N. J. A. (ed.). "SequenceA080076(proth primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

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[1] "Sloane's A007703 : Regular primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.

[2] "Sloane's A031157 : Numbers that are both lucky and prime". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.

[3] Sloane, N. J. A. (ed.). "SequenceA080076(proth primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.

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