175897

Properties

Appears in sequences

• a(1) = 2; thereafter, a(n) is the smallest prime not yet used which is compatible with the condition that a(n) is a non-quadratic residue modulo a(k) for the next n indices k = n + 1, n + 2, ..., 2n.at n=30A249797
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 587", based on the 5-celled von Neumann neighborhood.at n=8A273078
• Prime numbersat n=15981