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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Sean A. Irvine, Table of n, a(n) for n = 1..50 EXAMPLE a(4) = 1830 is a term as 1, 8, 3 and 0 have odd and even parity alternately. CROSSREFS Cf. A068876, A030152, A068882, A068884. Sequence in context: A240681 A113348 A193274 * A087599 A337826 A226360 Adjacent sequences: A068880 A068881 A068882 * A068884 A068885 A068886 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

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Last modified September 18 01:35 EDT 2024. Contains 375995 sequences. (Running on oeis4.)