53263

Appears in sequences

• Row sums of number triangle A154221.at n=14A154222
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 251", based on the 5-celled von Neumann neighborhood.at n=42A271018
• G.f. satisfies: A(x)^2 = A( x^2/(1 - 2*x - 4*x^2) ).at n=10A274479
• Starts of runs of 3 consecutive Niven numbers in base 2 (A049445).at n=26A330932
• a(n) is the least k such that A033273(k) is equal to (A033273(n*k + 1) - 1)/n where A033273(n) is the number of nonprime divisors of n.at n=16A352256