A158246 Positive numbers that have at least one two-letter substring repeated when spelled out in English.

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

Offset

1,1

Comments

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.

Links

Table of n, a(n) for n=1..54.

Example

sevENteEN has the substring "EN" repeated.

Crossrefs

Sequence in context: A066470 A054478 A136198 * A279428 A275244 A002252

Adjacent sequences: A158243 A158244 A158245 * A158247 A158248 A158249

Keyword

easy,nonn,word

Author

Cihan Altay (cihanaltay(AT)gmail.com), Mar 14 2009

Status

approved