Cubic Recurring Digital Invariant/Examples/919

Example of Cubic Recurring Digital Invariant

$919$ is a cubic recurring digital invariant:

$\ds 919: \ \ $

$\ds 9^3 + 1^3 + 9^3$

$=$

$\ds 729 + 1 + 729$

$\ds = 1459$

$\ds 1459: \ \ $

$\ds 1^3 + 4^3 + 5^3 + 9^3$

$=$

$\ds 1 + 64 + 125 + 729$

$\ds = 919$

$\blacksquare$

1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $153$
1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $153$