A349887 -id:A349887 - cp's OEIS frontend

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

Eric Angelini, Dec 04 2021

			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.

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

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

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

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

A351799 Numbers which, when written in French, contain exactly one instance of the letter E.

Original entry on oeis.org

0, 2, 4, 7, 9, 11, 12, 14, 15, 17, 19, 21, 22, 24, 27, 29, 40, 43, 45, 46, 48, 50, 53, 55, 56, 58, 60, 63, 65, 66, 68, 70, 78, 80, 81, 83, 85, 86, 88, 90, 98, 100, 101, 103, 105, 106, 108, 110, 118, 120, 123, 125, 126, 128, 300, 301, 303, 305, 306, 308, 310

Offset: 1

Carole Dubois and Eric Angelini, Feb 19 2022

ZERO(0) has one E (and is thus in the sequence), UN(1) has no E, DEUX(2) has one, TROIS(3) has none, QUATRE(4) has one E (and is thus in the sequence). etc.

Cf. A006933 ('Eban' numbers), A349887 (exactly one instance in English), A349888 (exactly two instances in English),

from num2words import num2words
from unidecode import unidecode
def ok(n): return unidecode(num2words(n, lang='fr')).count("e") == 1
print([k for k in range(311) if ok(k)]) # Michael S. Branicky, Feb 19 2022

cp's OEIS Frontend

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

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