3233230

Appears in sequences

• Number of tree-rooted bridgeless planar maps with two vertices and n faces.at n=12A002740
• Denominators of partial sums of Bernoulli numbers B_{2n} = A000367/A002445.at n=9A035077
• Denominator of b(n) = Sum_{k'<=n} 1/k', where k' denotes the squarefree numbers.at n=21A072983
• Triangle read by rows: T(n,k) = A002110(n)/prime(n+1-k), k = 1..n.at n=34A077011
• a(n) = product[k=0..n] P(k), where P(k) is the smallest prime > 3*n. a(n) = product[k=0..n] A118751(k).at n=6A118752
• Triangle T(n,k) read by rows: T(n,0) = A002110(n) and T(n,k) = A002110(n)/prime(k) for 1<=k<=n.at n=38A121281
• Denominator of the fraction c(n) defined in A172030.at n=19A172031
• Denominators of a companion to the Bernoulli numbers.at n=20A192366
• Let a(n) and the ratio r(n) = greatest prime divisor of a(n) / sum of the distinct prime divisors of a(n). The sequence a(n) is defined by the recurrence a(1) = 2, a(n+1) such that r(n+1) < r(n).at n=20A203461
• Triangle read by rows: T(n, k) = v(n, k)*((1/v(n, k)) mod prime(k)), where v(n, k) = (Product_{j=1..n} prime(j))/prime(k), n >= 1, 1 <= k <= n.at n=29A240673
• Largest number that can be encoded as Product_{i:lambda} prime(i) for a partition lambda of n into distinct parts.at n=34A246868
• Number of 2n-length strings of balanced parentheses of exactly 10 different types that are introduced in ascending order.at n=1A258398
• Triangle in which n-th row contains all possible products of n-1 of the first n primes in descending order.at n=29A258566
• "Near Primorial" numbers.at n=25A259629
• a(n) = Product_{d|n, d<n} prime(1+A001414(d)), where A001414(d) gives the sum of prime factors of d, with repetition.at n=23A319692
• Least k such that Sum_{i=1..n} k^i / i is a positive integer.at n=20A333072
• a(1) = 1; thereafter a(n) = a(n-1) / lpf(n) if lpf(n) divides a(n-1), otherwise a(n) = a(n-1) * lpf(n), where lpf is the least prime factor function A020639.at n=22A337643
• Records in A110765.at n=14A342125
• Indices of records in A353693.at n=37A353695
• a(n) is the denominator of the sum of the reciprocals of the first n squarefree numbers.at n=14A354418