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 A068884 Largest n-digit triangular number with property that digits alternate in parity, or 0 if no such number exists. 2
 6, 78, 903, 9870, 96141, 941878, 9850141, 98947278, 985036305, 9892547470, 98585094741, 989436909450, 9898947258903, 98969892923278, 989872901298945, 9898987276765450, 98985850965876105, 989898183850729896, 9898969072503098503 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Sean A. Irvine, Table of n, a(n) for n = 1..50 EXAMPLE a(4) = 9870 is a term as 9, 8, 7 and 0 have odd and even parity alternately. CROSSREFS Cf. A068876, A030152, A068882, A068883. Sequence in context: A370714 A145360 A183405 * A186663 A069670 A074112 Adjacent sequences: A068881 A068882 A068883 * A068885 A068886 A068887 KEYWORD base,nonn AUTHOR Amarnath Murthy, Mar 19 2002 EXTENSIONS a(6)-a(19) from Donovan Johnson, Mar 11 2011 STATUS approved

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Last modified August 5 06:04 EDT 2024. Contains 374935 sequences. (Running on oeis4.)