A117383 Positive numbers whose Spanish names do not include repeated letters.

1, 2, 3, 4, 10, 11, 12, 15, 80, 100, 1000, 1001, 1002, 1003, 1004, 1011, 1012, 1080, 2000, 3000, 3001, 4000, 11000, 12000, 80000

Offset: 1

Author

Rodolfo Kurchan, Apr 24 2006

Keywords

• fini
• full
• nonn
• word

Crossrefs

Cf. A059916, A354681.

Programs

Python

from num2words import num2words as n2w
def letters(n):
    return "".join(c for c in n2w(n, lang='es') if c.isalpha())
def ok(n):
    w = letters(n)
    return len(w) == len(set(w))
print([k for k in range(1, 100000) if ok(k)]) # Michael S. Branicky, Jun 08 2022