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 A008521 Numbers that do not contain the letter 'o'. 8
 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 23, 25, 26, 27, 28, 29, 30, 33, 35, 36, 37, 38, 39, 50, 53, 55, 56, 57, 58, 59, 60, 63, 65, 66, 67, 68, 69, 70, 73, 75, 76, 77, 78, 79, 80, 83, 85, 86, 87, 88, 89, 90, 93, 95, 96, 97, 98, 99, 300, 303, 305, 306, 307 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS There are exactly 454 oban numbers. - Eric W. Weisstein, Nov 09 2003 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..454 Roel and Bas van Dijk, Numerals package, Hackage (Haskell packages). Eric Weisstein's World of Mathematics, Oban Number Index entries for sequences related to number of letters in n PROG (Haskell) import Data.Maybe (fromJust) import Data.Text (Text); import qualified Data.Text as T (all) import Text.Numeral.Grammar.Reified (defaultInflection) import qualified Text.Numeral.Language.EN as EN -- see link a008521 n = a008521_list !! (n-1) a008521_list = filter (T.all (/= 'o') . numeral) [0..] where numeral :: Integer -> Text numeral = fromJust . EN.gb_cardinal defaultInflection -- Reinhard Zumkeller, Jan 23 2015 (Python) from num2words import num2words afull = [k for k in range(1000) if "o" not in num2words(k)] print(afull[:70]) # Michael S. Branicky, Aug 18 2022 CROSSREFS Cf. A006933 (ban e), A089589 (ban i), A008523 (ban t), A089590 (ban u). Sequence in context: A009005 A362018 A138884 * A299489 A039231 A194387 Adjacent sequences: A008518 A008519 A008520 * A008522 A008523 A008524 KEYWORD nonn,word,fini,full AUTHOR N. J. A. Sloane STATUS approved

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Last modified September 25 14:41 EDT 2023. Contains 365648 sequences. (Running on oeis4.)