Search results
Results from the WOW.Com Content Network
A number that is non-palindromic in all bases b in the range 2 ≤ b ≤ n − 2 can be called a strictly non-palindromic number. For example, the number 6 is written as "110" in base 2, "20" in base 3, and "12" in base 4, none of which are palindromes. All strictly non-palindromic numbers larger than 6 are prime.
Another beastly palindromic prime is 700666007. [4] Ribenboim defines a triply palindromic prime as a prime p for which: p is a palindromic prime with q digits, where q is a palindromic prime with r digits, where r is also a palindromic prime. [5] For example, p = 10 11310 + 4661664 × 10 5652 + 1, which has q = 11311 digits, and 11311 has r ...
The number 59 becomes a palindrome after three iterations: 59 + 95 = 154; 154 + 451 = 605; 605 + 506 = 1111, so 59 is not a Lychrel number either. Numbers such as 196 are thought to never become palindromes when this reversal process is carried out and are therefore suspected of being Lychrel numbers.
A palindrome is when something can be read the same way backwards and forwards. ... you can point out that it doesn't apply if you write the year as a 4 digit number, or the month as a 2 digit ...
Palindrome (game): a fast-paced, mind-stretching puzzler that forces you to unscramble palindromes in 30 seconds. j Palindrome (noun): A word, phrase, or sequence that reads the same backward as ...
For b > 4, if k < b/2 then k becomes palindromic after one iteration: k + k = 2k, which is single-digit in base b (and thus a palindrome). If k > b /2, k becomes palindromic after two iterations. The smallest number in each base which could possibly be a Lychrel number are (sequence A060382 in the OEIS ):
Palindromes: Say, 45288254 or 02100120. Collectors call them "radars." Collectors call them "radars." Repeaters: Blocks of repeating digits, like 85858585, are nice.
Some sequences have alternate names: 4n+1 are Pythagorean primes, 4n+3 are the integer Gaussian primes, and 6n+5 are the Eisenstein primes (with 2 omitted). The classes 10 n + d ( d = 1, 3, 7, 9) are primes ending in the decimal digit d .