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A068883
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Smallest n-digit triangular numbers with property that digits alternate in parity, or 0 if no such number exists.
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1
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1, 10, 105, 1830, 10585, 107416, 1038961, 10109256, 101410161, 1014503490, 10143650961, 101072103210, 1012143638925, 10101274165450, 101014143472945, 1010363290981278, 10101078125834905, 101012169252147076, 1010125816103490141
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| a(4) = 1830 is a term as 1, 8, 3 and 0 have odd and even parity alternately.
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CROSSREFS
| Cf. A068876, A030152, A068882, A068884.
Sequence in context: A000457 A113348 A193274 * A087599 A068097 A190956
Adjacent sequences: A068880 A068881 A068882 * A068884 A068885 A068886
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 19 2002
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EXTENSIONS
| a(7)-a(18) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 14 2010
a(19) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 11 2011
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