

A008521


Numbers that do not contain the letter `o'.


5



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
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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 !! (n1)
a008521_list = filter (T.all (/= 'o') . numeral) [0..] where
numeral :: Integer > Text
numeral = fromJust . EN.gb_cardinal defaultInflection
 Reinhard Zumkeller, Jan 23 2015


CROSSREFS

Cf. A006933 (ban e), A089589 (ban i), A008523 (ban t), A089590 (ban u).
Sequence in context: A005527 A009005 A138884 * A039231 A194387 A039175
Adjacent sequences: A008518 A008519 A008520 * A008522 A008523 A008524


KEYWORD

nonn,word,fini,full


AUTHOR

N. J. A. Sloane.


STATUS

approved



