21531778

Appears in sequences

• Markov numbers satisfying region 5 (x=5) of the equation x^2 + y^2 + z^2 = 3xyz.at n=13A030452
• Markov numbers that are semiprime.at n=21A182585
• Markoff numbers that are powers of one odd prime or twice powers of one odd prime.at n=27A386894