Palindromic Triangular Numbers with Palindromic Halves
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Sequence of Palindromic Triangular Numbers
The sequence of palindromic triangular numbers which can be split into palindromic halves consists of:
- $55, 66, 828 \, 828$
There may be others, but none are known.
Sources
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $828,828$