24257

Appears in sequences

• E.g.f.: arcsinh(arctan(arctanh(x)))=x-1/3!*x^3+17/5!*x^5-281/7!*x^7+24257/9!*x^9...at n=4A012235
• a(1) = 4; a(n) is smallest semiprime > 2*a(n-1).at n=12A117880
• a(n) is the least k such that the remainder when 10^k is divided by k is n.at n=26A127818
• Integers arising in A133677.at n=23A133645
• a(n) = 2*a(n-1) - a(n-2) + 2*a(n-3) - a(n-4) + a(n-5), n > 5.at n=18A152718
• Write sin(x)/x = Product_{n>=1} (1 + g_n*x^(2*n)); a(n) = numerator(g_n).at n=6A170916
• Number of nondecreasing arrangements of 6 numbers x(i) in -(n+4)..(n+4) with the sum of sign(x(i))*2^|x(i)| zero.at n=41A187990
• G.f. satisfies: A(x) = (1 + x*A(x))*(1 + x^3*A(x)^2).at n=14A192415
• Numbers n such that there are a, b with abs(sigma(a) - sigma(b)) = sigma(n) - n and a U b = n, where U is decimal concatenation.at n=22A239563
• Semiprimes of the form S(n) + T(n) where S(n) and T(n) are the n-th square and the n-th triangular numbers.at n=20A240914
• Numbers k such that 49^k - 7^k - 1 is prime.at n=7A265485
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 934", based on the 5-celled von Neumann neighborhood.at n=7A273793
• Numbers such that the sum of the reverse of their aliquot parts is equal to the reverse of the sum of their aliquot parts.at n=22A278948
• a(n) is the area of the smallest rectangle that the Harter-Heighway Dragon Curve will fit in after n doublings, starting with a segment of length 1.at n=14A362566