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A068642 Index of the smallest n-digit palindromic triangular number. If no such number exists then 0. 3
1, 10, 18, 77, 173, 1111, 1593, 8382, 18906, 50281, 167053, 0, 1620621, 6307938, 15126258, 50008881, 149142458, 846122222, 2480116437, 5513600773, 14667896198, 49786655918, 246644446642, 529670494286, 2466444446642 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

P. De Geest, Exhaustive list of Palindromic Triangulars

EXAMPLE

a(4) = 77 as 77*78/2 = 3003 is palindromic. a(12) = 0 as no 12 digit palindromic triangular exists.

CROSSREFS

Cf. A068641, A068643, A068644, A000217, A003098, A008509, A008510, A054263.

Sequence in context: A266708 A186235 A241053 * A198309 A167342 A288781

Adjacent sequences:  A068639 A068640 A068641 * A068643 A068644 A068645

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.