here are some mathmatical equations that produce 666, the sign of the beast.
the beast number is equal to the sum of the squares of the first 7 primes
and satisfies the identity
where
is the totient function.
there are exactly two ways to insert + signs into the sequence 123456789 to make the sum 666, and exactly one way for the sequence 987654321,
666 is a repdigit, and is also a triangular number
In fact, it is the largest repdigit triangular number. 666 is also a smith number.
Sums involving 666 include
which is the sum of numbers on a roulette wheel, which 38 pockets labelled 0, 00, and 1-36.
If you have trouble undestanding these equations, it's ok, you are just stupid.