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A008509
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Numbers n such that n-th triangular number is palindromic.
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11
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1, 2, 3, 10, 11, 18, 34, 36, 77, 109, 132, 173, 363, 1111, 1287, 1593, 1833, 2662, 3185, 3369, 3548, 8382, 11088, 18906, 50281, 57166, 102849, 111111, 167053, 179158, 246642, 337650, 342270, 365436, 417972, 1620621, 3240425, 3457634, 3707883
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Charles W. Trigg, Palindromic Triangular Numbers, J. Rec. Math., 6 (1973), 146-147.
D. Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1986, 93.
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..147 (from P. De Geest)
P. De Geest, Palindromic Triangulars
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CROSSREFS
| Cf. A003098, A002113, A000217, A083571, A050721, A050722.
Sequence in context: A081706 A032804 A047473 * A081868 A193652 A092986
Adjacent sequences: A008506 A008507 A008508 * A008510 A008511 A008512
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com)
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