A291663 -id:A291663 - cp's OEIS frontend

A167621 Numbers whose Spanish names begin with a vowel.

1, 8, 11, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830, 831, 832, 833, 834, 835, 836, 837, 838, 839, 840

Offset: 1

Claudio Meller, Nov 07 2009

			Uno, Ocho, Once, Ochenta, etc.

Álvar Ibeas, Table of n, a(n) for n = 1..10000

Cf. A000852 (English), A118549 (Dutch), A118557 (French), A291663 (Danish).

Missing term 800 added by Álvar Ibeas, Sep 18 2020

A118549 Numbers beginning with a vowel in Dutch.

Original entry on oeis.org

1, 8, 11, 18, 21, 28, 31, 38, 41, 38, 51, 58, 61, 68, 71, 78, 81, 88, 91, 98, 800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830

Offset: 1

Luc Stevens (lms022(AT)yahoo.com), May 03 2006

			Een, acht, elf, achttien, eenentwintig, achtentwintig, eenendertig, ...

Cf. A000852 (English), A118557 (French), A167621 (Spanish), A291663 (Danish).

A291664 Numbers beginning and ending with a vowel in Danish.

Original entry on oeis.org

8, 11, 21, 28, 31, 38, 41, 48, 100, 102, 103, 104, 108, 109, 110, 111, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 802, 803, 804, 808, 809, 811, 820, 821, 822, 823, 824, 825, 826

Offset: 1

Halfdan Skjerning, Aug 29 2017

The sequence of words is: otte, elleve, enogtyve, otteogtyve, enogtredive, otteogtredive.
In Danish, when pronouncing a two-digit number, the last number is mentioned first; for example, '21' is "enogtyve" ["one-and-twenty"], and '121' is "ethundredeogenogtyve" ["one-hundred-and-one-and-twenty"].
Please note that '100' can be both spelled and pronounced as "hundrede", "ethundrede", "hundred" and "ethundred"; similarly, '1000' can be spelled "tusinde", "ettusinde", "tusind" and "ettusind". The "et" in "ethundrede" is often omitted in daily speech.
Intersection of A291621 and A291663. - Iain Fox, Oct 17 2017

Brady Haran and Tom Scott, 58 and other Confusing Numbers, Numberphile video (2015)
Wikipedia, List of numbers in various languages

Cf. A000861, A079741, A098060, A247751, A291621, A291663.

All numbers beginning with '1' or '8', except for two-digit numbers that do not end in '1' or '8', and that also end with 02, 03, 04, 08, 09, 10, 3n, 4n, n00, or n000 will begin and end with a vowel.

cp's OEIS Frontend

A167621 Numbers whose Spanish names begin with a vowel.

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A118549 Numbers beginning with a vowel in Dutch.

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A291664 Numbers beginning and ending with a vowel in Danish.

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