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