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Yes, the number 21 is indeed a triangular number. Other triangular numbers are 6,10, and 15.

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โˆ™ 2015-09-24 18:30:02
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โˆ™ 2011-10-12 15:08:58

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Q: Is 21 a triangular number
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Related questions

What is the 6th triangular number?

21


How do you find the 20Th triangular number?

The 20th triangular number is 20*21/2 = 210


Is 32 a triangular number?

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How can sixth triangular number be 21?

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Is 144 a triangular number?

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