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A068642
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Index of the smallest n-digit palindromic triangular number. If no such number exists then 0.
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3
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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; internal format)
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OFFSET
| 1,2
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LINKS
| P. De Geest, Exhaustive list of Palindromic Triangulars
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EXAMPLE
| a(4) = 77 as 77*78/2 = 3003 is palindromic. a(12) = 0 as no 12 digit palindromic triangular exists.
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CROSSREFS
| Cf. A068641, A068643, A068644, A000217, A003098, A008509, A008510, A054263.
Sequence in context: A050576 A144376 A186235 * A198309 A167342 A177172
Adjacent sequences: A068639 A068640 A068641 * A068643 A068644 A068645
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 28 2002
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EXTENSIONS
| Edited by Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 24 2002.
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