217938

Appears in sequences

• Numbers n such that sigma(n) = phi(n) + phi(n-1) + phi(n-2) + phi(n-3).at n=6A067203
• Consider the base-8 Kaprekar map n->K(n) defined in A165090. Sequence gives numbers belonging to cycles, including fixed points.at n=21A165095
• Consider the base-8 Kaprekar map n->K(n) defined in A165090. Sequence gives numbers belonging to cycles of length greater than 1.at n=16A165097
• a(n) = Sum_{k=1..n} binomial(k+2,3) * n^(n-k).at n=7A368535