28w
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The GCF is 4.
There is no such formula. Rectangular numbers are composite numbers and there is no known formula that will generate either composite numbers or prime numbers.
C-I-R-C-U-L-A-R-C-E-N-T-I-P-E-D-E-U-N-D-E-R-A-B-E-A-C-H-U-M-B-R-E-L-L-A