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A158246
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Positive numbers that have at least one two-letter substring repeated when spelled out in English.
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0
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17, 22, 27, 33, 44, 55, 66, 75, 77, 88, 91, 99, 101, 103, 109, 117, 119, 121, 122, 123, 127, 129, 131, 133, 139, 141, 143, 144, 149, 151, 153, 155, 159, 161, 163, 166, 169, 171, 173, 175, 177, 179, 181, 183, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197
(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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Names exclude spaces and hyphens (e.g., onehundredtwentyone).
Letters in a substring are consecutive. No reversals.
7878 is the smallest positive number that contains 11 different two-letter substrings repeated in its name.
3333 is the smallest positive number that contains a two-letter substring repeated 5 times.
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LINKS
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EXAMPLE
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sevENteEN has the substring "EN" repeated.
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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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Cihan Altay (cihanaltay(AT)gmail.com), Mar 14 2009
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STATUS
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approved
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