28 is a triangular number because it is the sum of the integers 1 through 7. The next larger triangular number is 36, the sum of the integers 1 through 8. Therefore 26 is not a triangular number. Notice 28 = 7 times 8 divided by two and 36 = 8 times 9 divided by two. So what's the next triangular number??
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Is 63 a triangular number I think it is a triangular number.
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yes it is a triangular number
No, 18 is not a triangular number.
No, 35 is not a triangular number.