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+ The second unique prime in hexadecimal (base 16).

+ The prime numbers are identified as N0241 in Sloane's original "Handbook of Integer Sequences."

+ The smallest prime p such that p plus the reversal of p equals a palindromic prime. [Luhn]


+ The smallest duodecimal prime: p = (x^12 + y^12 )/(x^4 + y^4 ). [Russo]

+ The smallest non-palindromic prime which can be expressed as sum of a number and its reverse, i.e., 241 = 170 + 071. [Gupta]

+ The system of equations: 2w + 3x + 5y + 7z = 11; 13w + 17x + 19y + 23z = 29; 31w + 37x + 41y + 43z = 47; 53w + 59x + 61y + 67z = 71; has four fractions as its solution, each of which has denominator 241. [Rupinski]

+ The smallest prime p such that the concatenation of p in base 10 down up to base 2 is prime. [Russo]

+ The smallest prime p such that p7 can be written as the sum of 7 consecutive primes. Note that 2 + 4 + 1 = 7. [Rivera]

+ The radioisotope americium-241 is used in many smoke detectors.

+ The smallest prime value (out of 14) resulting from the ninedigital fraction equation (A/B)^C + (D/E)^F + (G/H)^I, where the letters A to I represent any combination of the nine digits 1 through 9. Note that (6/3)^5 + (8/4)^7 + (9/1)^2 and (6/3)^7 + (8/4)^5 + (9/1)^2 are the only two distinct solutions for 241. [De Geest]

+ 241 is the only number m such that prime(m) = pi(m * pi(m)). [Firoozbakht]

+ The United States Supreme Court case Chesapeake & Ohio Railway Company v. Asa P. Carnahan can be found on Page 241 of Volume 241.

+ This easy-to-remember member of a twin prime pair is pronounced, "two for one." Get it?

+ 241 = prime(prime(2!!*4!!*1!!)). [Javadifar]

+ There are 241 known numbers that cannot be written as the sum of at most four tetrahedral numbers. [Capelle]

+ The largest known prime p such that the reversal of (p! + p) is prime. [Firoozbakht]

+ Washington D.C. schools chancellor Michelle Rhee once fired 241 teachers at the same time.

+ If A = 1, B = 2, C = 3, ... , Z = 26, then 'THE RIEMANN HYPOTHESIS' is prime. [Homewood]

+ The largest prime that can be represented as sum of three double-digit emirps, i.e., 71+73+97=241. [Loungrides]

+ The smallest prime of form n!+239. The sequence begins 241, 263, 359, 5279, etc., and its 22nd term is arguably the most interesting! [Honaker]

+ 241 = (22^2-2)/2. Can you find the next prime of form (t^2-2)/2, where t is a repdigit of form 2*(10^n-1)/9? [Honaker]

+ During the Terror, the Military Commission presided over by Lenoir sentenced 241 people to death. Reference: Alfred Lallié (1896) La justice révolutionnaire à Nantes et dans la Loire-Inférieure. Nantes, B. Cier, p. xxvii. [Olry]

+ 241 = 8*30+1 divides 8^2+30^2. Can you find a larger prime of the form ab+1 that divides a^2+b^2, where a and b are positive integers? [Honaker]

(There are 11 curios for this number that have not yet been approved by an editor.)

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