91903

Appears in sequences

• Numbers n such that 2*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=13A102955
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 521", based on the 5-celled von Neumann neighborhood.at n=16A288898
• Number of unique X-rays of n X n binary matrices with exactly n ones.at n=39A290133