Email Print Arithmetic Sequence on 01 February 2016. Posted in Algebra A sequence of numbers in an orderly list. \(....,\; -15,\; -10,\; -5,\; 0,\; 5,\; 10,\; 15,\; ....\) \(....,\; 1,\; 7,\; 14,\; 21,\; 28,\; 35,\; ....\) \(....,\; -4.5,\; -3,\; -1.5,\; 0,\; 1.5,\; 3,\; 4.5,\; ....\)