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 A098949 Numbers where 9 is the only odd decimal digit. 2
 9, 29, 49, 69, 89, 90, 92, 94, 96, 98, 99, 209, 229, 249, 269, 289, 290, 292, 294, 296, 298, 299, 409, 429, 449, 469, 489, 490, 492, 494, 496, 498, 499, 609, 629, 649, 669, 689, 690, 692, 694, 696, 698, 699, 809, 829, 849, 869, 889, 890, 892, 894, 896, 898 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This is a regular language in base 10. - Charles R Greathouse IV, Oct 05 2011 The number of terms of this sequence that are smaller than 10^n is n*5^(n-1). - Stefan Steinerberger, Jun 06 2006 Any number of 9s is permitted. - Harvey P. Dale, May 07 2019 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..2000 Index entries for 10-automatic sequences MATHEMATICA Select[Range[1000], DigitCount[ # ][[1]] == 0 && DigitCount[ # ][[3]] == 0 && DigitCount[ # ][[5]] == 0 && DigitCount[ # ][[7]] == 0 && DigitCount[ # ][[9]] >0 &] (* Stefan Steinerberger, Jun 06 2006; corrected by Harvey P. Dale, May 07 2019 *) Select[Range[1000], Union[Select[IntegerDigits[#], OddQ]]=={9}&] (* Harvey P. Dale, May 07 2019 *) PROG (Perl) for (0..1000) { print "\$_, " if (/^[024689]*9[024689]*\$/) } # Charles R Greathouse IV, Oct 05 2011 (Python) def ok(n): return set(str(n)) & set("13579") == set("9") print(list(filter(ok, range(899)))) # Michael S. Branicky, Sep 29 2021 CROSSREFS Sequence in context: A032700 A322946 A350963 * A031296 A146869 A129397 Adjacent sequences: A098946 A098947 A098948 * A098950 A098951 A098952 KEYWORD base,easy,nonn AUTHOR Eric Angelini, Oct 21 2004 EXTENSIONS More terms from Stefan Steinerberger, Jun 06 2006 STATUS approved

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Last modified September 7 13:22 EDT 2024. Contains 375730 sequences. (Running on oeis4.)