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Search: id:A068641
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| A068641 |
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Smallest n-digit palindromic triangular number. If no such number exists then 0. |
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+0
4
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| 1, 55, 171, 3003, 15051, 617716, 1269621, 35133153, 178727871, 1264114621, 13953435931, 0, 1313207023131, 19895044059891, 114401848104411, 1250444114440521, 11121736463712111, 357961407704169753
(list; graph; listen)
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OFFSET
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1,2
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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) = 3003 = 77*78/2 and smallest 4 digit palindrome. a(12) = 0 as no 12 digit palindromic triangular exists.
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CROSSREFS
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Cf. A068642, A068643, A068644, A000217, A003098, A008509, A008510, A054263.
Sequence in context: A043510 A044387 A044768 this_sequence A039781 A135657 A161763
Adjacent sequences: A068638 A068639 A068640 this_sequence A068642 A068643 A068644
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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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