On Black-Hole Numbers of Iteration of Digital Biquadratic Sum in Base 7, 11, 13 or 14

There are different periodic and fixed points under the iteration of biquadratic sum of digits of positive integer in different carry systems. There are one fixed point, one 3-circle, one 4-circle, one 6-circle, one 8-circle and one 12-circle in base 7; three fixed points, one 2-circle, one 7-circle and one 18-circle in base 11; two fixed pointsk, two 2-circles, one 5-circle, one 7-circle and one 11-circle in base 13; one fixed point, one 2-circle and one 13-circle in base 14.