Need a formula for birthday present adventure

Question

Hello,

My brother's birthday is tomorrow, and i've bought several presents and hid them, each having a hint to the next. Since he's studying to be an engineer of some sort, i wanted to make a complicated formula with 4 variables that results in a large number he has to convert to text.

The variables are:

A = 2806
B = 2712
C = 0407
D = 2906

and the answer should be:
1382051845315131621205181111920

The formula can be complicated, but doesn't need to be, as long as it looks like a challenge and takes some time to be completed.

You will be credited! (unless you don't want to) :D

Thanks in advance

Tim Falken

Answer 1

y=root[exp(-abs(x/3))*sin(x/5)]

yu kan put in a, b,c...weerever yu feel like

Answer 2

me hope yu realize yer number hav 31 digits, so kant yuze kalkulater

gotta du math bi hand

& that limit yu tu + - * / ^

but yu dont want "/"...it wood make anser smaller

Answer 3

square root av yer number= 1,175,607,011,426,493.5

maebee start with (big number )^2

me dont thank yu wanna du  A^B

maebe A^c ???