262027

Properties

Appears in sequences

• a(n) = Sum_{k=1..n} C(n,k) * sigma(k)^(n-k) for n>=1.at n=7A251658
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 133", based on the 5-celled von Neumann neighborhood.at n=17A279139
• a(n) is the largest prime p < 2^n such that p + 2^n is also prime.at n=16A282565
• Prime numbersat n=22989