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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] Internationally renowned researcher Dr. Karen Rogers did a study of 241 profoundly gifted children in 19941995 during a postdoctoral fellowship. It was especially useful to parents who had observed developmental differences in their children but were unaware of what those differences may signify. The smallest duodecimal prime: p = (x^12 + y^12 )/(x^4 + y^4 ). [Russo] The smallest nonpalindromic 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 p^{7} can be written as the sum of 7 consecutive primes. Note that 2 + 4 + 1 = 7. [Rivera] The radioisotope americium241 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) = (m * (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 easytoremember 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]
(There are 11 curios for this number that have not yet been approved by an editor.)
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