A331481 Position of the first letter of n-th (in English) in the alphabet.

26, 6, 19, 20, 6, 6, 19, 19, 5, 14, 20, 5, 20, 20, 6, 6, 19, 19, 5, 14, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19

Offset: 0

Author

J. Marcel Feenstra, Jan 18 2020

Keywords

• nonn
• word

Examples

			'First' begins with 'F', the sixth letter, hence a(1)=6.
		

Crossrefs

Cf. A005606 (analog for cardinal numbers).

Programs

Mathematica

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

Python

from num2words import num2words
import unidecode
def A331481(n):
    return ord(unidecode.unidecode(num2words(n, to='ordinal')).lower()[0]) - 96 # Chai Wah Wu, Feb 27 2020