49 is the seventh
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It is 243.
28"21" but to be extra smart the answer is "The seventh triangular number is twenty one."
Multiply it by 1/7
The ordinal number for the cardinal number 47 is written forty-seventh.
Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".