241 (number)

Last updated
240 241 242
Cardinal two hundred forty-one
Ordinal 241st
(two hundred forty-first)
Factorization prime
Prime twin prime
Greek numeral ΣΜΑ´
Roman numeral CCXLI
Binary 111100012
Ternary 222213
Senary 10416
Octal 3618
Duodecimal 18112
Hexadecimal F116

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).

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700 is the natural number following 699 and preceding 701.

600 is the natural number following 599 and preceding 601.

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900 is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10 it is a Harshad number. It is also the first number to be the square of a sphenic number.

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References

  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.