For the other direction, Chowla and Mian observed that the greedy algorithm gives an infinite Sidon sequence with for every x.
sequence | Limit of a sequence | Thue–Morse sequence | sequence (poetry) | main sequence | Frölicher spectral sequence | Specker sequence | Sobol sequence | Shine-Dalgarno sequence | Sequence of Saint Eulalia | Sequence motif | Nucleic acid sequence | dream sequence | Xeelee Sequence | The Echorium Sequence | The Dark Is Rising Sequence | Slab monolith, like the first sequence of ''2001: A Space Odyssey | Signal sequence | Sequence (poetry) | Sequence (music) | Sequence learning | Sequence assembly | Regulatory sequence | regulatory sequence | Regular sequence (algebra) | Regular sequence | Reginald of Sidon | Rapid sequence induction | Novel sequence | Mid-May 2008 tornado outbreak sequence |