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An arithmetic sequence
algebra
Align the two numbers as you would in decimal subtraction. Append leading zeros if necessary to represent both numbers with the same number of digits Apply two's complement to the second term Add the complemented number to the first term. The sum in the previous step should have one more digit than you started with.
add up the 2 previous ones.
To get the next term, add the sum of all previous terms to the most recent term.