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The October issue of the Notices of the Amer. Math. Soc. has an article about the OEIS.

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A068644 Index of the largest n-digit palindromic triangular number. If no such number exists then 0. 3
3, 11, 36, 132, 363, 1287, 3548, 11088, 18906, 111111, 417972, 0, 3707883, 12812392, 37009916, 128127032, 368505751, 1014708805, 3567632391, 11151642876, 36657342048, 104561417190, 417898160427, 1325269593372 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..24.

P. De Geest, Exhaustive list of Palindromic Triangulars

EXAMPLE

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

CROSSREFS

Cf. A068641, A068642, A068643, A000217, A003098, A008509, A008510, A054263.

Sequence in context: A100068 A260745 A119213 * A286318 A119054 A119090

Adjacent sequences:  A068641 A068642 A068643 * A068645 A068646 A068647

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Feb 28 2002

EXTENSIONS

Edited by Patrick De Geest, Mar 24 2002.

STATUS

approved

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Last modified September 23 02:13 EDT 2018. Contains 315271 sequences. (Running on oeis4.)