19369

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 84 ones.at n=17A031852
• Semiprimes which are the sum of three distinct positive cubes in two or more distinct ways.at n=26A180089
• Numbers n such that 4n+1 is a palindromic prime.at n=40A192261
• Triangle of coefficients of polynomials u(n,x) jointly generated with A209576; see the Formula section.at n=62A209575
• O.g.f. satisfies: A(x) = Sum_{n>=0} n^n * x^n * A(n^2*x^2)^n/n! * exp(-n*x*A(n^2*x^2)).at n=8A216247
• Numbers n such that the decimal number concat(6,n) is a square.at n=31A273361
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -1, a(1) = 2, a(2) = 3, a(3) = 4.at n=19A295721
• Successive records of function f(x) = log(abs(pi(x) - R(x)))/log(x) where pi(x) is the number of primes <= x and R(x) is Riemann's prime counting function.at n=52A353055