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

Author

Paul Duckett, Jun 02 2022

Keywords

• easy
• fini
• full
• sign
• word
• less

Examples

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

Crossrefs

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

Programs

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