Palindromic Triangular Numbers with Palindromic Halves

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): $828,828$
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