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A068641 Smallest n-digit palindromic triangular number. If no such number exists then 0. 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 and smallest 4 digit palindrome. a(12) = 0 as no 12 digit palindromic triangular exists.

CROSSREFS

Cf. A068642, A068643, A068644, A000217, A003098, A008509, A008510, A054263.

Sequence in context: A044768 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 September 24 04:27 EDT 2017. Contains 292403 sequences.