614400

Appears in sequences

• a(n) = Sum_{d|n, n/d=1 mod 4} d^4 - Sum_{d|n, n/d=3 mod 4} d^4.at n=27A050468
• 16-almost primes (generalization of semiprimes).at n=19A069277
• McKay-Thompson series of class 4A for the Monster group with a(0) = 24.at n=7A097340
• Denominator of Product_{k=1..n} H(k), where H(k) = Sum_{j=1..k} 1/j, the k-th harmonic number.at n=7A097424
• McKay-Thompson series of class 4A for the Monster group.at n=7A107080
• McKay-Thompson series of class 4A for the Monster group with a(0) = 4.at n=7A134786
• Triangle read by rows: T(n,k) is the number of permutations p of {1,2,...,n} for which the number of j < ceiling(n/2) such that p(j) + p(n+1-j) = n+1 is equal to k (n>=1; 0<=k <=ceiling(n/2)).at n=43A155517
• Number of k < 10^n such that A047988(k) = 1.at n=5A213530
• Composite numbers such that product_{i=1..k} (p_i/(p_i-1)) / sum_{i=1..k} (p_i/(p_i-1)) is an integer, where p_i are the k prime factors of n (with multiplicity).at n=29A227034
• Triangle read by rows: T(n,k) = A059383(n)/(A059383(k)*A059383(n-k)).at n=38A238754
• Triangle read by rows: T(n,k) = A059383(n)/(A059383(k)*A059383(n-k)).at n=42A238754
• Sequence A255412 sorted into ascending order, with duplicates removed.at n=31A254035
• a(n) = A000203(A255334(n)).at n=37A255412
• Number of defective (binary) heaps on n elements where three ancestor-successor pairs do not have the correct order.at n=11A324064
• a(n) = 1*binomial(n,2) + 3*binomial(n,3) + 6*binomial(n,4) + 10*binomial(n,5).at n=25A361474
• Main diagonal of A376738: a(n) is the n-th number which is the product of n (possibly non-distinct) primes having the same number of decimal digits.at n=15A376739