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Search: id:A068644
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| A068644 |
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Index of the largest n-digit palindromic triangular number. If no such number exists then 0. |
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+0
4
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| 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; listen)
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OFFSET
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1,1
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LINKS
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P. De Geest, Exhaustive list of Palindromic Triangulars
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EXAMPLE
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a(4) = 132 as 132*133/2 = 8778 is palindromic. a(12) = 0 as no 12 digit palindromic triangular number exists.
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CROSSREFS
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Cf. A068641, A068642, A068643, A000217, A003098, A008509, A008510, A054263.
Sequence in context: A017938 A100068 A119213 this_sequence A119054 A119090 A048361
Adjacent sequences: A068641 A068642 A068643 this_sequence A068645 A068646 A068647
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 28 2002
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EXTENSIONS
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Edited by Patrick De Geest (pdg(AT)worldofnumbers.com), Mar 24 2002.
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