A sequence of numbers, regular, if every number can be calculated or predicted by the succeding or preceding number.
Arithmetic or Linear
Special Case Natural and Integer Numbers
Special Case Renard Series
Sequence of Money, Mass, Length, Area and Volume Pieces or Units
Sequence of Times and Dates in Calendars and Watches
Music Tone Scales
Musical Cord Progression
Frequecies of Colors Distinguishable by Human or Animal Eyes
Frequecies of Light, Temperature?, Sound Distinguishable by Senses of Creatures
Screw Sizes, length, diameter, strength?
Nuts and Bolts Sizes
From number a to b in n steps.