646018

Appears in sequences

• Markoff (or Markov) numbers: union of positive integers x, y, z satisfying x^2 + y^2 + z^2 = 3*x*y*z.at n=38A002559
• Markov numbers satisfying region 5 (x=5) of the equation x^2 + y^2 + z^2 = 3xyz.at n=10A030452
• Non-Fibonacci Markoff numbers.at n=23A111032
• Markov numbers that are semiprime.at n=11A182585
• Composite Markoff numbers.at n=20A256395
• Second member m_2(n) of the Markoff triple MT(n) with largest member m(n) = A002559(n), and smallest member m_1(n) = A305313(n), for n >= 1. These triples are conjectured to be unique.at n=55A305314
• Markoff numbers that are powers of one odd prime or twice powers of one odd prime.at n=21A386894