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 A214532 List of words over {1,9} with equal numbers of 1's and 9's. 0
 19, 91, 1199, 1919, 1991, 9119, 9191, 9911, 111999, 119199, 119919, 119991, 191199, 191919, 191991, 199119, 199191, 199911, 911199, 911919, 911991, 919119, 919191, 919911, 991119, 991191, 991911, 999111, 11119999, 11191999 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This is to 9 as A214531 is to 8, as A214530 is to 7, as A214530 is to 6, as A214522 is to 5, as A214521 is to 4, as A214488 is to 3, and as A214218 is to 2. The subsequence of primes (when interpreted as decimal integers) is A087515. LINKS MATHEMATICA FromDigits/@(Flatten[Permutations/@Table[Join[Table[1, {n}], Table[9, {n}]], {n, 4}], 1]) (* Harvey P. Dale, Aug 20 2014 *) CROSSREFS Cf. A214218, A214488, A214521, A214522, A214524, A214530, A214531. Sequence in context: A043232 A044012 A288485 * A118294 A157098 A037238 Adjacent sequences:  A214529 A214530 A214531 * A214533 A214534 A214535 KEYWORD nonn,base,easy AUTHOR Jonathan Vos Post, Jul 20 2012 STATUS approved

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Last modified January 22 15:57 EST 2019. Contains 319364 sequences. (Running on oeis4.)