Calculating a lucky number for Libra
The lucky number for Libra (or any other name) is calculated by using a special table which gives a numeric value to each letter of the alphabet. The table we used is derived from the Kabbalah and used by Hebrew and Arab mystics.
Here are the letters of the roman alphabet and their values:
So the numbers for each letter of Libra are:
First we add the digits of all the letters: 3+1+2+2+1 = 9
Which gives Libra a lucky number of nine!
Calculating two digit lucky numbers for Libra
The two digit lucky numbers for Libra are those two digit numbers which when their digits are summed to give a single digit, give the lucky number (nine) for the name.
Mathematically, this turns out to be the set of numbers less than 100 of the form L + 9n (where L is the lucky number and n is a natural number).
Algorithmically, this is:
for ( int i = luckynum + 9; i < 100; i += 9 )
print( i );
Which, for Libra gives us: 18 27 36 45 54 63 72 81 90 99!