64769

Appears in sequences

• a(n) = 4th Chebyshev polynomial (second kind) evaluated at 2^n.at n=3A020541
• Good sequence of increments for Shell sort (best on big values).at n=13A033622
• Denominators of continued fraction convergents to sqrt(63).at n=9A041111
• Denominators of continued fraction convergents to sqrt(252).at n=9A041473
• Denominators of continued fraction convergents to sqrt(567).at n=9A042087
• n-th 6k+1 prime times n-th 6k-1 prime.at n=25A048629
• a(n) = n^4 - 3*n^2 + 1.at n=16A057722
• Nonprime numbers k such that (k+1)*Sum_{d|k} 1/(d+1) is an integer.at n=20A069155
• Chebyshev U(n,x) polynomial evaluated at x=8.at n=4A077412
• Chebyshev polynomial of the second kind U(4,n).at n=8A144139
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 553", based on the 5-celled von Neumann neighborhood.at n=40A272848
• Semiprimes where the sum of the digits equals the difference between the prime factors.at n=12A308821
• a(n) = U(n, 2*n), where U(n, x) is the Chebyshev polynomial of the second kind.at n=4A349075