A351799 - OEIS

A351799

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

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

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.

LINKS

Table of n, a(n) for n=1..61.

PROG

(Python)

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

CROSSREFS

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

Sequence in context: A308496 A226812 A185978 * A120749 A187978 A190193

Adjacent sequences: A351796 A351797 A351798 * A351800 A351801 A351802

KEYWORD

nonn,word,less

AUTHOR

Carole Dubois and Eric Angelini, Feb 19 2022

STATUS

approved