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A068127
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Triangular numbers with sum of digits = 3.
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6
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3, 21, 120, 210, 300, 10011, 20100, 2001000, 200010000, 20000100000, 2000001000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| 1. The sequence is unbounded, as the 2*10^k -th triangular number is a term. 2. The sum of the digits of triangular numbers in most cases is a triangular number.
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CROSSREFS
| Sequence in context: A046727 A084159 A117512 * A171137 A144884 A004658
Adjacent sequences: A068124 A068125 A068126 * A068128 A068129 A068130
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 21 2002
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EXTENSIONS
| More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 06 2002
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