Calculating a lucky number for Willifrid
The lucky number for Willifrid (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:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| 1 | 2 | 3 | 4 | 5 | 8 | 3 | 5 | 1 | 1 | 2 | 3 | 4 | 5 | 7 | 8 | 1 | 2 | 3 | 4 | 6 | 6 | 6 | 5 | 1 | 7 |
So the numbers for each letter of Willifrid are:
| W | i | l | l | i | f | r | i | d |
| 6 | 1 | 3 | 3 | 1 | 8 | 2 | 1 | 4 |
First we add the digits of all the letters: 6+1+3+3+1+8+2+1+4 = 29
Which is still more than one digit
so we add the digits of 29: 2+9 = 11
Which is still more than one digit
so again we add the digits of 11: 1+1 = 2
Which gives Willifrid a lucky number of two!
Calculating two digit lucky numbers for Willifrid
The two digit lucky numbers for Willifrid are those two digit numbers which when their digits are summed to give a single digit, give the lucky number (two) 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 Willifrid gives us: 11 20 29 38 47 56 65 74 83 92!