a little silliness

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Started by **bear** - Feb. 22, 2022, 3:06 p.m.

at 2:22, today, it will be 2:22, on 2-22-22

see, you needed just one little reason to smile today.

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2/22/22 at 2:22 and on a "Two"s (Tuesday) day to boot! Talk about twos being wild!

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I'm so glad that you guys pointed this out before it was over because I'd been thinking about that for days and forgot to start a thread!

https://www.usatoday.com/story/news/nation/2022/02/22/twosday-2-22-22-palindrome/6884226001/

The deuces are wild today as one of the grandest palindromes of 2022 arrives on Tuesday, unofficially known as "Twosday."

Feb. 22, 2022, is written out numerically is 2/22/22. Not only is it a palindrome because it reads the same forward and backward, but what makes it special is the date has all twos. It will also be the same no matter what part of the world you're in, regardless of whether your country uses the day-month-year or year-month-day format.

It also will be on a Tuesday, (and 290 years after George Washington was born). The date is so rare the National Weather Service says a "Twosday" won't happen again for another 400 years, in 2422.

The ultimate palindrome will occur at 2:22 a.m. or p.m., or at 22:22 military time.

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https://en.wikipedia.org/wiki/Palindrome

A **palindrome** is a word, number, phrase, or other sequence of characters which reads the same backward as forward, such as *madam* or *racecar*. There are also numeric palindromes, including date/time stamps using short digits *11/11/11 11:11* and long digits *02/02/2020.* For example; Tuesday, 22 February 2022 is considered a palindrome day (*22022022* using dd-mm-yy format) as it can be read from left to right or vice versa. Sentence-length palindromes ignore capitalization, punctuation, and word boundaries.

The palindrome ΝΙΨΟΝ ΑΝΟΜΗΜΑΤΑ ΜΗ ΜΟΝΑΝ ΟΨΙΝ 'Wash your sins, not only your face' in Greek on a holy water font.

Composing literature in palindromes is an example of constrained writing.

The word *palindrome* was introduced by Henry Peacham in 1638.^{[1]} It is derived from the Greek roots πάλιν 'again' and δρóμος 'way, direction'; a different word is used in Greek, καρκινικός 'carcinic' (lit. *crab-like*) to refer to letter-by-letter reversible writing

In most genomes or sets of genetic instructions, palindromic motifs are found. The meaning of palindrome in the context of genetics is slightly different, however, from the definition used for words and sentences. Since the DNA is formed by two paired strands of nucleotides, and the nucleotides always pair in the same way (Adenine (A) with Thymine (T), Cytosine (C) with Guanine (G)), a (single-stranded) sequence of DNA is said to be a palindrome if it is equal to its complementary sequence read backward. For example, the sequence ACCTAGGT is palindromic because its complement is TGGATCCA, which is equal to the original sequence in reverse complement.

In automata theory, a set of all palindromes in a given alphabet is a typical example of a language that is context-free, but not regular. This means that it is impossible for a computer with a finite amount of memory to reliably test for palindromes. (For practical purposes with modern computers, this limitation would apply only to impractically long letter-sequences.)

In addition, the set of palindromes may not be reliably tested by a deterministic pushdown automaton which also means that they are not LR(k)-parsable or LL(k)-parsable. When reading a palindrome from left-to-right, it is, in essence, impossible to locate the "middle" until the entire word has been read completely.

It is possible to find the longest palindromic substring of a given input string in linear time.^{[51]}^{[52]}

Among aperiodic words, the largest possible palindromic density is achieved by the Fibonacci word, which has density 1/φ, where φ is the Golden ratio.^{[53]}

I never knew that there is a Fibonacci word as well as numbers.

https://en.wikipedia.org/wiki/Fibonacci_number

In mathematics, the **Fibonacci numbers**, commonly denoted *F _{n}*, form a sequence, the

- 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...

The Fibonacci numbers were first described in Indian mathematics,^{[2]}^{[3]}^{[4]} as early as 200 BC in work by Pingala on enumerating possible patterns of Sanskrit poetry formed from syllables of two lengths. They are named after the Italian mathematician Leonardo of Pisa, later known as Fibonacci, who introduced the sequence to Western European mathematics in his 1202 book *Liber Abaci*.^{[5]}

Fibonacci numbers appear unexpectedly often in mathematics, so much so that there is an entire journal dedicated to their study, the *Fibonacci Quarterly*. Applications of Fibonacci numbers include computer algorithms such as the Fibonacci search technique and the Fibonacci heap data structure, and graphs called Fibonacci cubes used for interconnecting parallel and distributed systems. They also appear in biological settings, such as branching in trees, the arrangement of leaves on a stem, the fruit sprouts of a pineapple, the flowering of an artichoke, an uncurling fern, and the arrangement of a pine cone's bracts.

Fibonacci numbers are strongly related to the golden ratio: Binet's formula expresses the nth Fibonacci number in terms of n and the golden ratio, and implies that the ratio of two consecutive Fibonacci numbers tends to the golden ratio as n increases. Fibonacci numbers are also closely related to Lucas numbers, which obey the same recurrence relation and with the Fibonacci numbers form a complementary pair of Lucas sequences.