A247807 Numbers in decimal representation with distinct digits, such that in Italian and Portuguese their digits are in alphabetic order.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 21, 23, 24, 26, 27, 28, 29, 30, 31, 40, 41, 43, 46, 47, 50, 51, 52, 53, 54, 56, 57, 58, 59, 60, 61, 63, 67, 70, 71, 73, 80, 81, 83, 84, 86, 87, 90, 91, 93, 94, 96, 97, 98, 210, 230, 231, 240, 241, 243, 246, 247, 260, 261

Offset: 1

Author

Reinhard Zumkeller, Oct 05 2014

Keywords

• nonn
• base
• word
• fini
• full

Comments

List of decimal digits, alphabetically sorted by their names in Italian resp. Portuguese: 5 cinque cinco, 2 due dois/duas, 9 nove nove, 8 otto oito, 4 quattro quatro, 6 sei seis, 7 sette sete, 3 tre tres, 1 uno um, 0 zero zero;

finite sequence with last and largest term a(1023) = 5298467310.

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..1023
• Wikipedia, Zahlen in unterschiedlichen Sprachen
• Wikipedia, List of numbers in various languages

Crossrefs

Intersection of A010784 and A247757.

Cf. A247800 (Czech), A247801 (Danish), A247802 (Dutch), A053433 (English), A247803 (Finnish), A247804 (French), A247805 (German), A247806 (Hungarian), A247808 (Latin), A247809 (Norwegian), A247810 (Polish), A247811 (Russian), A247812 (Slovak), A247813 (Spanish), A247809 (Swedish), A247814 (Turkish).

Programs

Haskell

import Data.IntSet (fromList, deleteFindMin, union)
import qualified Data.IntSet as Set (null)
a247807 n = a247807_list !! (n-1)
a247807_list = 0 : f (fromList [1..9]) where
   f s | Set.null s = []
       | otherwise  = x : f (s' `union`
         fromList (map (+ 10 * x) $ tail $ dropWhile (/= mod x 10) digs))
       where (x, s') = deleteFindMin s
   digs = [5, 2, 9, 8, 4, 6, 7, 3, 1, 0]