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A008510
Both n and n-th triangular number are palindromes.
+0
9
1, 2, 3, 11, 77, 363, 1111, 2662, 111111, 246642, 11111111, 363474363, 2664444662, 26644444662, 246644446642, 266444444662, 2466444446642, 3654345456545434563
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Maintained by
N. J. A. Sloane
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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.
AT&T Labs Research
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