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Yes, there are triangular numbers that end in 000. For example, 2,001,000 and 7,998,000.

You can find a triangular number T that ends in 000 using the formula

T = (1/2)(k)(k+1),

where k is equal to any of the following:

2000n

2000n+1999

125(16n+11)

16(125n+39)

and n is any positive integer.

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Q: Are there any triangular numbers that end in 000?
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