2494800

Appears in sequences

• a(n) = (4n+3)!/4^n.at n=2A052278
• Number of degree-n even permutations of order exactly 8.at n=10A061134
• Numbers k such that sigma(k) - usigma(k) > 3k.at n=9A063875
• a(n) = denominator(b(n)), where b(1) = b(2) = 1, b(n) = (b(n-1) + b(n-2))/(n-1).at n=11A069944
• Size of largest conjugacy class in A_n, the alternating group on n symbols.at n=10A070733
• Least m with n*(n+1)/2 divisors.at n=23A081620
• Generalized Stirling2 array (4,2).at n=31A090438
• SuperRefactorable numbers: m=A005179(n) such that k=m/n is an integer.at n=36A110821
• a(n) = number of elements of order n in simple group Alt(11) of order 19958400.at n=7A145822
• Areas for which there are more tatami-free rooms (cf. A165633) than for any smaller size.at n=25A165762
• Number of permutations of 1..n with the sequence of sums of 7 adjacent elements having exactly 3 maxima.at n=1A179733
• a(n) is the least number such that there are n semiprimes pq such that (p+1)(q+1) = a(n) for each semiprime.at n=26A180334
• a(n) = product(i >= 0, P(n, i)^(2^i)) where P(n, i) = product(p prime, n/2^(i+1) < p <= n/2^i).at n=12A220027
• Reduced denominators of A179420(n)/n!, where e.g.f. A(x) = Sum_{n>=0} A179420(n)/n! satisfies: A(A(x)) = x*A'(x) with A(0)=0, A'(0)=1.at n=13A221020
• Smallest number with the property that exactly n of its divisors are partition numbers.at n=19A236110
• Numbers that set a record for the number of divisors that are partition numbers.at n=15A236111
• Common Sigma, Uncommon Clique Numbers: a(n) is the minimal s for which there exists a set of n pairwise relatively prime integers with a sigma value of s.at n=29A239635
• Terms of A005179 divisible by their indices in order of appearance in A005179.at n=38A262983
• Where records occur in A054025.at n=30A272720
• Least number k such that the number of its divisors is n times the number of its prime factors, counted with multiplicity.at n=23A275819