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 A068644 Index of the largest n-digit palindromic triangular number, or 0 if no such number exists. 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 the largest 4-digit palindromic triangular number. 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 25 15:05 EDT 2023. Contains 365648 sequences. (Running on oeis4.)