Palindromic Triangular Numbers with Palindromic Index/Historical Note
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Historical Note on Palindromic Triangular Numbers with Palindromic Index
David Wells reports in Curious and Interesting Numbers, 2nd ed. that Charles Ashbacher reports on this sequence (in particular $363 \, 474 \, 363$) in Journal of Recreational Mathematics, Volume $24$, page $184$, but this has not been corroborated.
Sources
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $363,474,363$