A005606 Position of first letter of n (in English) in alphabet.

26, 15, 20, 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, 19, 19, 19, 19, 19, 19

Offset: 0

Author

N. J. A. Sloane

Keywords

• word
• nonn
• nice
• easy

Comments

English name for n begins with a(n)-th letter.

Examples

			'One' begins with 'O' and 'O' is the fifteenth letter hence a(1)=15.
		

References

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

Links

• Harvey P. Dale, Table of n, a(n) for n = 0..1000
• Chris Cole, Email to N. J. A. Sloane, Apr 23 1994 (contains many letter sequences, including the letter equivalent of A005606).

Programs

Mathematica

Table[LetterNumber[Characters[IntegerName[n,"Words"]][[1]]],{n,0,80}] (* Harvey P. Dale, Jun 06 2016 *)

Python

from num2words import num2words
def a(n): return ord(num2words(n)[0]) - 96
print([a(n) for n in range(78)]) # Michael S. Branicky, Jul 12 2022

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Oct 02 2000