A081365 Numbers whose name in American English is a word-palindrome, reading the same forward and backward.

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

Offset

1,1

Comments

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

References

M. J. Halm, More Sequences, Mpossibilities 83, April 2003.

Links

Table of n, a(n) for n=1..41.

M. J. Halm, Sequences

Example

a(1) = 101 because "one hundred one" is the first number name which is a word palindrome.

Crossrefs

Sequence in context: A162670 A252664 A134970 * A138131 A069858 A357033

Adjacent sequences: A081362 A081363 A081364 * A081366 A081367 A081368

Keyword

easy,nonn,word,changed

Author

Michael Joseph Halm, Apr 20 2003

Extensions

Name edited and data corrected by Michael S. Branicky, Jun 19 2024

Status

approved