A090589 -id:A090589 - cp's OEIS frontend

A007485 Number of letters in n (in Dutch) counting 'ij' as one letter.

3, 4, 4, 4, 3, 3, 5, 4, 5, 4, 3, 6, 7, 8, 7, 7, 9, 8, 9, 7, 12, 13, 13, 13, 12, 12, 14, 13, 14, 6, 11, 12, 12, 12, 11, 11, 13, 12, 13, 7, 12, 13, 13, 13, 12, 12, 14, 13, 14, 6, 11, 12, 12, 12, 11, 11, 13, 12, 13, 6, 11, 12, 12, 12, 11, 11, 13, 12, 13, 8, 13

Offset: 1

N. J. A. Sloane

The 'ij' in 'vijf' has been counted as one letter here. Counting it as one or two letters are both common in Dutch. - André Engels, Dec 07 2003

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Index entries for sequences related to number of letters in n

Cf. A090589 gives the sequence when 'ij' is counted as two letters.

A331482 Position of the first letter of n (in Dutch) in the alphabet.

Original entry on oeis.org

14, 5, 20, 4, 22, 22, 26, 26, 1, 14, 20, 5, 20, 4, 22, 22, 26, 26, 1, 14, 20, 5, 20, 4, 22, 22, 26, 26, 1, 14, 4, 5, 20, 4, 22, 22, 26, 26, 1, 14, 22, 5, 20, 4, 22, 22, 26, 26, 1, 14, 22, 5, 20, 4, 22, 22, 26, 26, 1, 14, 26, 5, 20, 4, 22, 22, 26, 26, 1, 14, 26

Offset: 0

J. Marcel Feenstra, Jan 18 2020

			'Een' (Dutch for 'one') begins with 'E', the fifth letter of the alphabet, hence a(1)=5.

Wikibooks, Rekenen/Natuurlijke getallen

Cf. A005606 (English), A161377 (Spanish), A277685 (Portuguese).

Cf. other Dutch sequences: A090589, A247802.

a[n_] := LetterNumber @ Characters[IntegerName[n, {"Dutch","Ordinal"}]][[1]]; Array[a, 100, 0] (* Amiram Eldar, Jan 18 2020 *)

from num2words import num2words
import unidecode
def A331482(n):
    return ord(unidecode.unidecode(num2words(n, lang='nl')).lower()[0]) - 96 # Chai Wah Wu, Feb 27 2020

A164838 Number of letters in n-th prime (in Dutch).

Original entry on oeis.org

4, 4, 4, 5, 3, 7, 9, 9, 13, 14, 11, 13, 12, 13, 14, 13, 14, 11, 13, 13, 14, 15, 13, 14, 15, 10, 11, 12, 12, 14, 21, 18, 20, 20, 21, 19, 21, 19, 20, 21, 22, 19, 20, 21, 22, 22, 14, 24, 25, 25, 23, 24, 23, 23, 23, 24, 24, 26, 23, 26, 23

Offset: 1

Ivan Panchenko, Aug 28 2009

The 'ij' in 'vijf' (five) has been counted as two letters here, as in A090589.

			a(1) = 4 because the first prime is 2, and it has in the Dutch language (twee) 4 letters.

Cf. A090589.

a(n) = A090589(prime(n)). - Michel Marcus, Sep 05 2013

a(21)-a(25) from Charles R Greathouse IV, Aug 26 2017

a(26)-a(60) from J.W.L. (Jan) Eerland, Jun 27 2023

cp's OEIS Frontend

A007485 Number of letters in n (in Dutch) counting 'ij' as one letter.

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A331482 Position of the first letter of n (in Dutch) in the alphabet.

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A164838 Number of letters in n-th prime (in Dutch).

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