1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 252
2x2x3x3x7=252
The numbers for the vertebrates are 252.
12 and 252
252
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There are several pairs of numbers that multiply to get 252. One example is 12 and 21, since 12 x 21 = 252. Another pair is 9 and 28, as 9 x 28 also equals 252.
126 and 252, among others.
How about 2 times 126 = 252 as one example
252
1+251
252 2x126 2x2x63 2x2x3x3x7
The least common multiple of the numbers 180 and 252 is 1,260.