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A day or timestamp is a palindrome when its digits are the same when reversed. Only the digits are considered in this determination and the component separators (hyphens, slashes, and dots) are ignored. Short digits may be used as in 11/11/11 11:11 or long digits as in 2 February 2020.
The first nine terms of the sequence 1 2, 11 2, 111 2, 1111 2, ... form the palindromes 1, 121, 12321, 1234321, ... (sequence A002477 in the OEIS ) The only known non-palindromic number whose cube is a palindrome is 2201, and it is a conjecture the fourth root of all the palindrome fourth powers are a palindrome with 100000...000001 (10 n + 1).
The palindromic numbers containing only 1, 8, and 0, constitute natural numeric ambigrams (visually symmetrical through a mirror). Also, because the glyph 2 is graphically the mirror image of 5, it means numbers like 205 or 85128 are natural numeral mirror ambigrams. Though not palindromic in the mathematical sense, they read frontward and ...
An animation of the anadrome of wolf and flow.. An anadrome [1] [2] [3] [4] [a] is a word or phrase whose letters can be reversed to spell a different word or phrase ...
[1] The term was coined in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford. [2] It is a contrived acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart." [3] A historically common type of CAPTCHA (displayed as reCAPTCHA v1) was first invented in 1997 by two groups working in parallel ...
A palindromic place is a city or town whose name can be read the same forwards or backwards. An example of this would be Navan in Ireland. Some of the entries on this list are only palindromic if the next administrative division they are a part of is also included in the name, such as Adaven, Nevada.
Poison Profits. A HuffPost / WNYC investigation into lead contamination in New York City
Kate Bush used phonetic reversal in her songs "Watching You Without Me" (1985) and "Leave it Open" (1982). The English rock band Radiohead used the effect on the song "Like Spinning Plates", released on their 2001 album Amnesiac. Singer Thom Yorke sang the lyrics backwards; this recording was in turn reversed to create "backwards-sounding ...