perplexus.info :: Numbers : Cut off the Tail

Cut off the Tail (Posted on 2024-03-31)

Find at least two triangular numbers a and b (numbers of the form N(N+1)/2), such that:
(1) Each of a and b include all 10 decimal digits.
(2) And each of a and b remain triangular when you delete the units digit from each of them.

No Solution Yet Submitted by K Sengupta

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