Customers at Blanket Security can   .
choose the combinations for their   .
safes, as long as the combinations  .
are number series that begin with   .
the number 1.                       .
The owner of Blanket Security has   .
bought a Safe Programming Machine.  .
This machine uses a formula to      .
produce the customer's combination. .
                                    .
Your job is to find the formula that.
will generate each customer's       .
combination.                        .
                                    .
                                    .
The customer's combination will     .
appear here.                        .
                                    .
                                    .
                                    .
You fill in the two numbers that    .
will make the formula produce each  .
customer's combination here.        .
                                    .
                                    .
When one of the numbers in the      .
combination is substituted for L,   .
the formula should produce the next .
number in the combination.          .
                                    .
Remember that the first number in   .
each combination is 1.              .
                                    .
                                    .
                                    .
So, if a customer wanted the series .
1, 3, 7, 15, 31 you would use the   .
formula Lx2+1. First, substitute 1  .
for L (1x2+1=3). Next, substitute 3 .
for L (3x2+1=7) and so on.          .
The series of numbers that the      .
completed formula produces will     .
appear here. If this series matches .
the customer's combination, you're  .
in business! If not, try again.     .