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A059916
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Nonnegative integers that when written out in full in English have no repeated letter.
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5
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0, 1, 2, 4, 5, 6, 8, 10, 40, 46, 60, 61, 64, 80, 84, 5000
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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COMMENTS
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If negative numbers are allowed then there are two more terms, namely -40 and -2. - Paul Duckett, Jun 05 2022
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REFERENCES
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GCHQ, The GCHQ Puzzle Book, Penguin, 2016. See page 70.
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LINKS
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PROG
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(Python)
from num2words import num2words as n2w
def letters(n):
return "".join(c for c in n2w(n).replace(" and", "") if c.isalpha())
def ok(n):
w = letters(n)
return len(w) == len(set(w))
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CROSSREFS
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KEYWORD
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fini,full,nonn,word
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AUTHOR
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EXTENSIONS
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More terms from George Russell (ger(AT)tzi.de), Nov 10 2004
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STATUS
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approved
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