29824

Appears in sequences

• Expansion of Product_{k>=1} (1 - x^k)^16.at n=15A000739
• The floor(n/3)-perfect numbers, where f-perfect numbers for an arithmetical function f are defined in A066218.at n=12A066238
• a(n)*a(n+3) - a(n+1)*a(n+2) = 2^n, given a(0)=1, a(1)=1, a(2)=2.at n=14A080877
• a(0)=1; a(n) = sigma_1(n) + sigma_3(n).at n=31A092345
• Triangular matrix, read by rows, that satisfies: T(n,k) = [T^2](n-1,k) when n>k>=0, with T(n,n) = (n+1).at n=31A102086
• a(n) = 2^n*A001519(n).at n=7A154626
• Numbers k that divide the k-th partial sum of all semiprimes.at n=11A173663
• Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|<|y-z|.at n=16A212681
• Numbers k whose abundance is 22: sigma(k) - 2*k = 22.at n=1A223612
• Numbers n such that prime(n) + reversal(prime(n)) is a square.at n=23A227371
• a(n) = n*(n^2 - 3*n + 4).at n=32A242659
• Number of numbers between min(p) and max(p) that are not parts of the partition p, summed over all partitions of n.at n=29A265252
• Numbers k such that each of k, k+1, k+2, and k+4 is a sum of two squares.at n=39A328224
• Practical numbers (A005153) that are abundant and have a record low value of abundancy index.at n=10A362052