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Concatenated Triangular Numbers (Posted on 2023-08-25) Difficulty: 3 of 5
Find a triangular number that remains triangular when it is concatenated to itself. For example, 6=3*4/2 is triangular and 66=11*12/2 is also triangular.

Find other examples.

No Solution Yet Submitted by K Sengupta    
Rating: 4.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
No SubjectK Sengupta2023-09-14 09:50:14
No SubjectRudyard Nolan2023-09-14 08:35:27
No SubjectRudyard Nolan2023-09-14 08:34:45
Some ThoughtsNot quite a proofLarry2023-08-25 07:39:22
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