2882880

Appears in sequences

• Denominators of coefficients for numerical differentiation.at n=14A002548
• Numbers k that are repdigits in more bases (smaller than k) than any smaller number.at n=40A066044
• a(1) = 1, a(n) = a(n-1) times smallest prime factor of n.at n=12A072486
• Least k such that n*prime(k) <= k*tau(k).at n=19A073066
• Highly composite numbers k such that 2*k is not a highly composite number.at n=14A073771
• Smallest integer value of n!/(2!3!...p!), where denominator contains product of factorials of primes in increasing order.at n=14A088302
• Duplicate of A088302.at n=14A096073
• SuperRefactorable numbers: m=A005179(n) such that k=m/n is an integer.at n=37A110821
• Denominator of x(n) = Sum_{k=1..n} ((odd part of k)/(k^2)).at n=14A111930
• Triangle T(n, k) = (n+2)!*(n*(n+1)*(2*n+1)/6)!/( (k^2)! * abs(2 + 2*k^2 - (n*(n + 1)*(2*n+1)/6))! ), read by rows.at n=7A123147
• Where records occur in A018892.at n=35A126098
• Numbers that can be written as (a^2-1)(b^2-1) in three or more distinct ways.at n=19A134856
• Triangle T(n, k) = H(n, k+1) - 2*H(n, k) - H(n, k-1), where H(n, k) = A060821(n+3, k), read by rows.at n=29A140873
• A product of quotients of factorials.at n=12A161887
• Areas for which there are more tatami-free rooms (cf. A165633) than for any smaller size.at n=26A165762
• Earliest sequence such that xy | a(x+y) for all x>=1, y>=1.at n=15A169900
• Numbers that set a record for number of even divisors: a(n) = 2*A002182(n).at n=39A181808
• Numbers n such that both n and n/2 are highly composite (A002182).at n=25A181809
• Members of A025487 whose prime signature is self-conjugate (as a partition).at n=17A181825
• a(n) = h(1)*h(2)*...*h(n), where h(i) = i/[g(i/2)*g(i/4)*g(i/8)*...] and g(x) = x if x is an integer and g(x) = 1 otherwise.at n=14A185021