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147 = 3 × 7²
FPB = 3 × 7 = 21
../..\.................../..\...
.2..63...............3..49...
...../..\................../..\...
....3..21...............7..7...
......../..\........................
.......3...7.......................
126 = 2 × 3² × 7
147 = 3 × 7²
FPB = 3 × 7
FPB = 21