428828400

Appears in sequences

• Least number k such that sigma(k) >= 2^n.at n=30A172516
• Numbers k such that sigma(k) > 5*k.at n=12A215264
• Number T(n,k) of partitions of an n-set with distinct block sizes and maximal block size equal to k; triangle T(n,k), k>=0, k<=n<=k*(k+1)/2, read by columns.at n=37A262078
• Primitive 5-abundant numbers: Numbers k such that sigma(k) > 5k (A215264) all of whose proper divisors d are 5-deficient numbers (having sigma(d) < 5d).at n=8A307115
• Squares of terms are the intersection of A025487 and A217584.at n=14A333969
• a(n) is the smallest number with exactly n divisors that are square pyramidal numbers.at n=19A358543