A102082 Number of times the n-th letter in an infinitely repeating English alphabet appears in the US English name for the number n.

0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 2, 0, 0, 0, 0, 0, 2, 0, 0, 2, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 2, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 3, 1, 1, 1

Offset

0,21

Links

Michael S. Branicky, Table of n, a(n) for n = 0..10000

Example

a(5) = 1 since letter 5 = e appears once in "five".
a(20) = 2 since letter 20 = t appears twice in "twenty".
a(34) = 1 since letter 34 = h appears once in "thirty four".
a(105) = 0 since letter 105 = a does not appear in "one hundred five".
a,b,c,... z, a, b, ... .
1,2,3,...26,27,28, ... .

Prog

(Python)
from num2words import num2words
def a(n): return num2words(n).replace(" and", "").count(chr(96+n%26))
print([a(n) for n in range(87)]) # Michael S. Branicky, Jul 15 2022

Crossrefs

Cf. A005589, A072959.

Sequence in context: A336757 A116376 A165766 * A358434 A030199 A320005

Adjacent sequences: A102079 A102080 A102081 * A102083 A102084 A102085

Keyword

nonn,word

Author

Jeremy Ballard (gtg056b(AT)prism.gatech.edu), Feb 13 2005

Extensions

Name clarified, a(0) inserted, and a(34) and beyond from Michael S. Branicky, Jul 15 2022

Status

approved