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it is the number such that 15 added to negative 15=0
It appears that the sequence is: {| |- | 0 1 3 7 15 31 63 127 255 511 1023 2047 4095 8191 |}
Adding zero to a number leaves the number unchanged.
There are 13 possible remainders: the numbers from 0 to 12 (inclusive).
Any number multiplied by 1 will always come out to be the original number. Any number multiplied by 0 will always equal 0. (7 x 1 = 7) (7 x 0 = 0)