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 A068641 Smallest n-digit palindromic triangular number, or 0 if no such number exists. 3
 1, 55, 171, 3003, 15051, 617716, 1269621, 35133153, 178727871, 1264114621, 13953435931, 0, 1313207023131, 19895044059891, 114401848104411, 1250444114440521, 11121736463712111, 357961407704169753 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..18. P. De Geest, Exhaustive list of Palindromic Triangulars EXAMPLE a(4) = 3003 = 77*78/2 is the smallest 4-digit palindromic triangular number. a(12) = 0 as no 12-digit palindromic triangular number exists. CROSSREFS Cf. A068642, A068643, A068644, A000217, A003098, A008509, A008510, A054263. Sequence in context: A352268 A276050 A256353 * A039781 A135657 A178793 Adjacent sequences: A068638 A068639 A068640 * A068642 A068643 A068644 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 December 2 07:23 EST 2023. Contains 367510 sequences. (Running on oeis4.)