57672

Appears in sequences

• Convolution of Bell numbers with themselves.at n=9A014322
• Numbers n such that sum of primes dividing n (with repetition) is equal to the largest prime factor of n+1.at n=34A071863
• The Wiener index of the Dutch windmill graph D(6,n) (n>=1).at n=35A180578
• The number of tilings of an equilateral triangle of side length n with k lozenges and n^2 - 2*k unit triangles. Triangle T(n, k) with n >= 1 and 0 <= k <= n*(n + 1)/2, read by rows.at n=22A273464
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of k-th power of continued fraction 1/(1 - x - x^2/(1 - 2*x - 2*x^2/(1 - 3*x - 3*x^2/(1 - 4*x - 4*x^2/(1 - ...))))).at n=75A292870
• Numbers k such that the powerful part of the sum of divisors of k (A387726) is greater than or equal to k, and sigma(k) is not itself a powerful number.at n=41A387729