52155

Appears in sequences

• Pisot sequence T(6,10), a(n) = floor(a(n-1)^2/a(n-2)).at n=21A020741
• Number of 4-block ordered bicoverings of an unlabeled n-set.at n=20A060091
• Numbers k such that sopfr(k) = sopf(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k).at n=30A064675
• Numbers n such that 2*n*k(n) is rational but not an integer, where k(n) is sum of successive remainders when computing the Euclidean algorithm for (1, 1/sqrt(n)) as defined in A086378 (MuPAD program is given there); numbers belonging to A086378 but not to A088900.at n=29A087414
• Number of 7's among the digits of all n-digit primes.at n=5A152279
• Numbers n such that n and n+1 both have 24 divisors.at n=30A274362
• Numbers k such that k and k+1 both have the prime signature (2,1,1,1) (A189982).at n=14A336658
• Regular triangle T(n,k) of Dellac configurations with boundaries, n>=1 and k>=0.at n=23A343198