    Sentence 1: For what Size Natural_number    does Bertrand's postutate hold?    Sentence 2: The Jatter formula.can, be         shown, using Bertrand's postulate (prove  first, by, Chebyshev), which, states thot  there olways. exists at, least one prime  HEBER Ps with<n, <p. <.29.- 2, for any  natural number n > 3;    