A068643 Largest n-digit palindromic triangular number, or 0 if no such number exists.

6, 66, 666, 8778, 66066, 828828, 6295926, 61477416, 178727871, 6172882716, 87350505378, 0, 68742000024786, 82078700787028, 684866959668486, 8208268228628028, 67898244444289876, 514816979979618415

Offset: 1

Author

Amarnath Murthy, Feb 28 2002

Keywords

• base
• nonn

Examples

			a(4) = 8778 = 132*133/2 is the largest 4-digit palindromic triangular number.
a(12) = 0 as no 12-digit palindromic triangular number exists.
		

Links

• P. De Geest, Exhaustive list of Palindromic Triangulars

Crossrefs

Cf. A068641, A068642, A068644, A000217, A003098, A008509, A008510, A054263.

Extensions

Edited by Patrick De Geest, Mar 24 2002