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A068883
Smallest n-digit triangular numbers with property that digits alternate in parity, or 0 if no such number exists.
2
1, 10, 105, 1830, 10585, 107416, 1038961, 10109256, 101410161, 1014503490, 10143650961, 101072103210, 1012143638925, 10101274165450, 101014143472945, 1010363290981278, 10101078125834905, 101012169252147076, 1010125816103490141
OFFSET
1,2
LINKS
EXAMPLE
a(4) = 1830 is a term as 1, 8, 3 and 0 have odd and even parity alternately.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Mar 19 2002
EXTENSIONS
a(7)-a(18) from Donovan Johnson, Mar 14 2010
a(19) from Donovan Johnson, Mar 11 2011
STATUS
approved