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A008523 Numbers that do not contain the letter `t'. 5
0, 1, 4, 5, 6, 7, 9, 11, 100, 101, 104, 105, 106, 107, 109, 111, 400, 401, 404, 405, 406, 407, 409, 411, 500, 501, 504, 505, 506, 507, 509, 511, 600, 601, 604, 605, 606, 607, 609, 611, 700, 701, 704, 705, 706, 707, 709, 711, 900, 901, 904, 905, 906, 907, 909, 911, 1000000, 1000001, 1000004, 1000005 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

See also A006933, the eban numbers (numbers not containing "e"), and A089589 (the iban numbers). This sequence might correspondingly be called the "tban" numbers. - WG Zeist, Aug 31 2012

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

Roel and Bas van Dijk, Numerals package, Hackage (Haskell packages)

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

a008523 n = a008523_list !! (n-1)

a008523_list = filter (T.all (/= 't') . 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), A008521 (ban o), A089590 (ban u).

Sequence in context: A095033 A010399 A215046 * A047568 A139453 A010391

Adjacent sequences:  A008520 A008521 A008522 * A008524 A008525 A008526

KEYWORD

nonn,word

AUTHOR

N. J. A. Sloane.

EXTENSIONS

a(57)-a(60) from WG Zeist, Aug 31 2012

STATUS

approved

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Last modified December 12 21:49 EST 2018. Contains 318081 sequences. (Running on oeis4.)