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

1,1

Links

Table of n, a(n) for n=1..18.

P. De Geest, Exhaustive list of Palindromic Triangulars

Example

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.

Crossrefs

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

Sequence in context: A073549 A119087 A119212 * A119053 A119089 A036523

Adjacent sequences: A068640 A068641 A068642 * A068644 A068645 A068646

Keyword

base,nonn,changed

Author

Amarnath Murthy, Feb 28 2002

Extensions

Edited by Patrick De Geest, Mar 24 2002

Status

approved