Circular Numbers are numbers whose powers end on the same figure as they do themselves: such are numbers ending in 0, 1, 5, 6.
Circular Numbers
Chambers's Encyclopaedia, Volume 3: Catarrh to Dion, p. 260
Source scan(s): p. 0271
Circular Numbers are numbers whose powers end on the same figure as they do themselves: such are numbers ending in 0, 1, 5, 6.