9000 (number): Difference between revisions - Wikipedia

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* '''9045''' – [[triangular number]]

* '''9059''' – Sophie Germain prime

* '''9072''' – [[decagonal number]]

* '''9077''' – [[Markov number]]<ref>{{cite OEIS|A002559| Markoff (or Markov) numbers: union of positive integers x, y, z satisfying x^2 + y^2 + z^2 = 3*x*y*z.}}</ref>

* '''9091''' – [[unique prime]]<ref>{{cite OEIS|A040017| Prime 3 followed by unique period primes (the period r of 1/p is not shared with any other prime) of the form A019328(r)/gcd(A019328(r),r) in order (periods r are given in A051627).}}</ref>