518656

Appears in sequences

• Expansion of 2*x^3/((1-2*x)^2*(1-4*x)).at n=11A000431
• Triangle read by rows: T(n,k) (n >= 1, 0 <= k <= ceiling(n/2)-1) = number of permutations of [n] with k peaks.at n=31A008303
• Numbers k such that sigma(k) = 2k + Omega(k), where Omega(n) is the number of prime divisors of n (with repetition).at n=4A063788
• Numbers k such that sigma(k) == 10 (mod k).at n=4A105869
• Composite numbers n that divide 2 * sigma(n) - d(n) [that is, 2 * sum of divisors - number of divisors].at n=7A135470
• Total sum of parts greater than 1 in all the partitions of n except one copy of the smallest part greater than 1 of every partition.at n=35A196025
• Numbers m whose abundance is 10: Sigma(m) - 2*m = 10.at n=2A223609