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A081365
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Numbers whose name in American English is a word-palindrome, reading the same forward and backward.
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0
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101, 202, 303, 404, 505, 606, 707, 808, 909, 1001, 2002, 3003, 4004, 5005, 6006, 7007, 8008, 9009, 10010, 11011, 12012, 13013, 14014, 15015, 16016, 17017, 18018, 19019, 20020, 21021, 22022, 23023, 24024, 25025, 26026, 27027, 28028, 29029, 30030, 31031, 32032
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The sequence considers hyphenated names (for non-multiples of 10 between 21 and 99) and treats those as single words, hence, "twenty-one thousand twenty-one" is a term. Indeed, all numbers of the form k*10^(3*i) + k for 1 <= k <= 99 and i > 0 are terms. - Michael S. Branicky, Jun 19 2024
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REFERENCES
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M. J. Halm, More Sequences, Mpossibilities 83, April 2003.
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LINKS
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EXAMPLE
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a(1) = 101 because "one hundred one" is the first number name which is a word palindrome.
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CROSSREFS
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KEYWORD
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easy,nonn,word
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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