Ok, I tried again, just to make sure I didn't have a typo on my claculator or sumpn.
Still
The last four digits are my phone number - but the first three?
It should show your phone number, assuming you have a seven digit number.
The math behind this, for anyone who is interested:
The forumla for the steps would be:
(((80x + 1) * 250 + 2y) - 250) * 0.5
where x is the first three digits of your phone number and y is the last four digits.
This can be simplified, as follows:
0.5 * ((80x + 1) * 250 + 2y) - 125
(80x + 1) * 125 + y - 125
125 * 80x + 125 + y - 125
125 * 80x + y
10000x + y
Note that the effect of multiplying by 10000 is to shift the first three digits of your phone number left by four digits, effectively "making room" for the last four digits.
So really someone just did the simple thing (multiply by 10000) then factored in a bunch of silly ways to obfuscate what they were doing...and make it look miraculous. LOL
L