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Earn +20 ptsQ: Is 15 a triangular number
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Is 21 a triangular number?
Yes, the number 21 is indeed a triangular number. Other triangular numbers are 6,10, and 15.
Which is the fifth triangular number?
Starting with 1, it is 15.
Is 32 a triangular number?
32 is not a triangular number. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, 36, 45, ...
Is 4 a triangular number?
no No it is not. The first 5 triangular numbers are: 1, 3, 6, 10, 15
Is 47 a triangular number?
47 is not a triangular number. Triangular numbers less than 100 are 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, and 91.
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