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Search: id:A068812
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| A068812 |
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Numbers n such that n and its 10's complement are both triangular numbers; i.e. n and 10^k - n (where k is the number of digits in n) are triangular numbers. |
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+0
1
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| 45, 55, 990, 1485, 4005, 4950, 5050, 5995, 8515, 9180, 285390, 499500, 500500, 714610, 1719585, 3064050, 6935950, 8280415, 49000050, 49995000, 50005000
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OFFSET
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1,1
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EXAMPLE
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1485 and 10000 - 1485 = 8515 both are triangular numbers.
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CROSSREFS
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Sequence in context: A168108 A037042 A119208 this_sequence A119071 A119158 A119204
Adjacent sequences: A068809 A068810 A068811 this_sequence A068813 A068814 A068815
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 07 2002
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EXTENSIONS
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More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 17 2002
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