230706

Appears in sequences

• Numbers k such that R_k + 20 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=25A256722
• 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 78", based on the 5-celled von Neumann neighborhood.at n=17A278788