A005606 Position of first letter of n (in English) in alphabet. (Formerly M4958)

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

0,1

Comments

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

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).

Example

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

Mathematica

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

Prog

(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

Crossrefs

Sequence in context: A033969 A078547 A036168 * A304138 A305044 A064267

Adjacent sequences: A005603 A005604 A005605 * A005607 A005608 A005609

Keyword

word,nonn,nice,easy

Author

N. J. A. Sloane

Extensions

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

Status

approved