212520

Appears in sequences

• Degrees of irreducible representations of Conway group Co2.at n=27A003911
• Products of 4 consecutive integers: a(n) = n*(n-1)*(n-2)*(n-3).at n=23A052762
• a(n) = n*(n-1)*(n-2)*(n-3) for n>=5.at n=23A052768
• Numbers k such that phi(k) < k/5.at n=27A066765
• a(n) = product of numbers from prime(n)+1 up to prime(n+1), where prime(n) is the n-th prime.at n=7A072472
• a(n) is the smallest k such that k + 1 and n*k + 1 both are perfect squares, or 0 if no such number exists.at n=58A084702
• Product of numbers obtained by adding one to the odd divisors of n and subtracting 1 from the even divisors.at n=23A086535
• Numbers that can be expressed as the difference of the squares of primes in exactly seventeen distinct ways.at n=1A092013
• Prime(prime(n))^2-1.at n=23A092771
• a(n) = (n-1)*(n-2)*...*(n-r) with the least value of r so that n divides a(n).at n=18A092914
• Maximal number of 165432 patterns in a permutation of 1,2,...,n.at n=28A100356
• Triangle read by rows: T(n,k) is the number of nonroot nodes of outdegree k (0<=k<=n-1) in all non-crossing trees with n edges.at n=49A100400
• Smallest number not yet used that is either a divisor or multiple of both n and a(n-1).at n=23A119862
• Number of labeled simply-rooted 2-trees with n labeled vertices (i.e., n+2 vertices altogether; a simply-rooted 2-tree is an externally rooted 2-tree whose root edge belongs to exactly one triangle).at n=4A120348
• Record numbers of A171063 nonzero period n solutions of x(i)=(x(i-1)+x(i-2)) mod m, as encountered in (n=1,m=1; n=1,m=2; n=2,m=1) antidiagonal order.at n=38A171061
• a(n) = n*binomial(n+4, 4).at n=20A174002
• Numbers with prime factorization p*q*r*s*t*u^3 (where p, q, r, s, t, u are distinct primes).at n=5A190378
• Numbers k such that Euler phi(Dedekind psi(k)) > k.at n=14A196200
• a(n) = (n-3)*(n-2)*(n-1)*n*(n+1)/30.at n=24A210569
• Numbers n such that the multiplicative group modulo n is the direct product of 7 cyclic groups.at n=5A272597