Why is 4 called as a black hole number?

Why is 4 called as a black hole number?




 Why is 4 called as a black hole number?


  A black hole is an invisible prison. Once we get into it, there is no escape. Similarly, a number which repeats itself after reaching it is called as a black hole number. Now how 4 is a black hole number? Let's see...

  Take any word from English dictionary. It can be any word. Now count the number of letters in that word. Then count the number of letters in the word form of that number. Continue the process.

  Let's take an example.
Word taken: Transplantation
No. of words: Fifteen (T, r, a, n, s, p, l, a, n, t, a, t, i, o, n)
No. of words: Seven (F, i, f, t, e, e, n)
No. of words: Five (S, e, v, e, n)
No. of words: Four (F, i, v, e)
No. of words: Four (F, o, u, r)
No. of words: Four (F, o, u, r)

  This process of number 4 will continue infinitely and  thus we can't get out of it. There will be no escape. Each step of counting is called as an iteration. Let's see some more examples...

Example 1:-
Word taken: Usual
No. of words: Five (U, s, u, a, l)
No. of words: Four (F, i, v, e)
No. of iterations: 2

Example 2:
Word taken: Abacus
No. of words: Six (A, b, a, c, u, s)
No. of words: Three (S, i, x)
No. of words: Five (T, h, r, e, e)
No. of words: Four (F, i, v, e)
No. of iterations: 4 
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