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241 (number)

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This article is about the number. For the year, see241. For other uses, see241 (disambiguation).

For uses of the phrase "two for one", see Two for one.

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Natural number

← 240

241

242 →

←240 241 242 243 244 245 246 247 248 249 →

←0 100 200 300 400 500 600 700 800 900 →

Cardinal

two hundred forty-one

Ordinal

241st
(two hundred forty-first)

twin prime

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CCXLI,ccxli

11110001₂

22221₃

1041₆

361₈

181₁₂

F1₁₆

241 (two hundred [and] forty-one) is the natural number between240 and242. It is also aprime number.

In mathematics

[edit]

241 is the larger of thetwin primes (239, 241). Twin primes are pairs of primes separated by 2.
241 is aregular prime^[1] and alucky prime.^[2] Since 241 = 15 × 2⁴ + 1, it is aProth prime.^[3]
241 is arepdigit in base 15 (111).
241 is the only knownLucas–Wieferich prime to (U,V) = (3, −1).

References

[edit]

^"Sloane's A007703 : Regular primes".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2016-05-28.
^"Sloane's A031157 : Numbers that are both lucky and prime".The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved2016-05-28.
^Sloane, N. J. A. (ed.)."Sequence A080076 (proth primes)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.

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