50516

Appears in sequences

• Let c(k) denote the k-th composite number and p(k) the k-th prime number; then a(n) = Sum_{i=n*(n-1)/2+1 .. n*(n+1)/2} c(i) - Sum_{i=1..n} p(i).at n=44A024850
• Numbers k such that (10*7^k -1)/3 is prime.at n=18A057018
• a(n) = 2*(n^3 + n^2 + n - 1).at n=29A155120
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 825", based on the 5-celled von Neumann neighborhood.at n=35A273581
• 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 62", based on the 5-celled von Neumann neighborhood.at n=15A278666
• Ranks of {2,3}-power towers with neither consecutive 2's nor consecutive 3's; see Comments.at n=29A299322