A354681 Integers whose names in French contain no letter more than once.

-4, -2, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 17, 19, 20, 22, 60, 100, 106, 110

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Example

-4 is named as "moins quatre" (all letters different).
13 is not in the data as "treize" repeats "e".

Prog

(Python)
from num2words import num2words as n2w
def letters(n):
    return "".join(c for c in n2w(n, lang='fr') if c.isalpha())
def ok(n):
    w = letters(n)
    return len(w) == len(set(w))
print([k for k in range(-99, 1000) if ok(k)]) # Michael S. Branicky, Jun 08 2022

Crossrefs

Cf. A059916 (English), A117383 (Spanish).

Sequence in context: A093486 A259618 A377036 * A115143 A093556 A021242

Adjacent sequences: A354678 A354679 A354680 * A354682 A354683 A354684

Keyword

easy,fini,full,sign,word,less

Author

Paul Duckett, Jun 02 2022

Status

approved