556920

Appears in sequences

• Increasing values of A000793 (largest order of permutation of n elements).at n=34A002809
• Number of diagonal dissections of a convex (n+6)-gon into n regions.at n=6A007160
• a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is an integer, s(0) = 0, |s(1)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2, s(n) = 4. Also a(n) = T(n,n-4), where T is the array defined in A025177.at n=11A025182
• Number of diagonal dissections of an n-gon into 7 regions.at n=5A033279
• Maximal order of element of alternating group A_{2n+1}.at n=30A057743
• Product of prime divisors of composite numbers between consecutive primes.at n=14A074167
• Largest element of n-th row of A080738.at n=24A080742
• Sigma unitary-sigma perfect numbers: numbers m which satisfy the following equation for some integer k: sigma(usigma(m)) = k*m where usigma(m) is sum of unitary divisors of m.at n=34A083288
• Array read by rows: T(n,k) = binomial(n+k-2,k-1)*binomial(2*n-1,n-k).at n=38A091811
• Numbers that can be expressed as the difference of the squares of primes in exactly eleven distinct ways.at n=16A092007
• Integers that can be expressed as a product of triangular numbers in 3 different ways.at n=13A110904
• Smallest number having exactly n triangular divisors.at n=24A130317
• Smallest k such that the partial sums of the divisors of k (taken in increasing order) contain exactly n primes.at n=30A187822
• Numbers with prime factorization pqrst^2u^3.at n=4A190390
• Numbers n such that sigma(n+sigma(n)) = 5*sigma(n).at n=17A246912
• Numbers k such that floor(Sum_{d|k} 1 / sigma(d)) = 3.at n=18A265713
• Numbers k such that the continued fraction of the abundancy index of k contains a single distinct element.at n=26A349686
• Numbers m such that A188999(A034448(m)) = k*m for some k, where A034448 and A188999 are respectively the unitary and the bi-unitary sigma function.at n=45A369205
• Array read by downward antidiagonals: A(n,k) = -A(n-1,k) + (k+1)*A(n-1,k+1) + A(n-1,k+2) with A(0,k) = 1, n >= 0, k >= 0.at n=52A369292
• Numbers k that set records in A372720.at n=27A371630