21620

Appears in sequences

• Numbers k such that sopfr(k + omega(k)) = sopfr(k), where sopfr(i) = A001414(i) and omega(i) = A001221(i).at n=22A187878
• a(n) = n + (n-1)*(n-2) + (n-3)*(n-4)*(n-5) + (n-6)*(n-7)*(n-8)*(n-9) + ... + ...*(n-n).at n=18A227363
• a(n) = 5*binomial(11*n+5,n)/(11*n+5).at n=4A234871
• Triangle of coefficients of Gaussian polynomials [2n+5,5]_q represented as finite sum of terms (1+q^2)^k*q^(g-k), where k = 0,1,...,g with g=5n.at n=64A267485
• Sum T(n,k) of the k-th last entries in all blocks of all set partitions of [n]; triangle T(n,k), n>=1, 1<=k<=n, read by rows.at n=39A286897
• Anagraprod Integers. Integers N that reproduce their multiset of digits when all the products of two successive digits of N are done (and considered together).at n=58A296451
• Number of distinct hook length sets of partitions of n.at n=46A301512
• Coefficients in asymptotic expansion of sequence A302557.at n=7A305275
• Number of integer partitions of n of which every permutation has a consecutive monotone triple, i.e., a triple (..., x, y, z, ...) such that either x <= y <= z or x >= y >= z.at n=44A344654
• Numbers that are the sum of six fourth powers in five or more ways.at n=11A345562
• Numbers that are the sum of six fourth powers in exactly five ways.at n=10A345817