54170

Appears in sequences

• Numbers n such that sigma(n)=2n-phi(phi(n)).at n=29A110073
• A129957(n) - n*(n-1)/2.at n=38A129959
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 229", based on the 5-celled von Neumann neighborhood.at n=42A270948