A349888 Numbers which, when written in English, contain exactly two instances of the letter E.

3, 7, 12, 13, 14, 15, 16, 21, 25, 28, 29, 33, 37, 43, 47, 53, 57, 63, 67, 70, 72, 74, 76, 81, 85, 88, 89, 91, 95, 98, 99, 100, 102, 104, 106, 130, 132, 134, 136, 140, 142, 144, 146, 150, 152, 154, 156, 160, 162, 164, 166, 201, 205, 208, 209, 210, 220, 222, 224, 226, 231, 235, 238, 239

Offset

1,1

Links

Michael S. Branicky, Table of n, a(n) for n = 1..10000

Example

THREE has two Es (and is thus in the sequence), FOUR has no E, FIVE has only one, SIX has none, SEVEN has two Es (and is thus in the sequence). Etc.

Prog

(Python)
from num2words import num2words
def ok(n): return num2words(n).count("e") == 2
print([k for k in range(311) if ok(k)]) # Michael S. Branicky, Feb 19 2022

Crossrefs

Cf. A006933 ('Eban' numbers) and A349887 (exactly one instance).

Sequence in context: A351103 A332464 A256563 * A243705 A057927 A298788

Adjacent sequences: A349885 A349886 A349887 * A349889 A349890 A349891

Keyword

word,nonn

Author

Eric Angelini, Dec 04 2021

Extensions

a(7) = 16 inserted by Michael S. Branicky, Feb 19 2022

Status

approved