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 A098949 Numbers where 9 is the only odd decimal digit. 1
 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 MATHEMATICA Select[Range[1000], DigitCount[ # ][[1]] == 0 && DigitCount[ # ][[3]] == 0 && DigitCount[ # ][[5]] == 0 && DigitCount[ # ][[7]] == 0 && DigitCount[ # ][[9]] >0 &] (* Stefan Steinerberger, Jun 06 2006 *) 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 CROSSREFS Sequence in context: A002642 A032700 A322946 * 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 First Mathematica program corrected by Harvey P. Dale, May 07 2019 STATUS approved

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Last modified December 8 18:37 EST 2019. Contains 329865 sequences. (Running on oeis4.)