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 Showing results 1 to 4 of 4 Search took 0.01 seconds. Search: Posts Made By: Batalov
 2021-09-23, 00:29 Replies: 13 Views: 815 Posted By Batalov That is funny (if it was supposed to be a joke) -... That is funny (if it was supposed to be a joke) - but incorrect. 9-digit palindrome primes exist and there are tons of them. For example, 100030001. 1234567...
 2021-09-21, 19:53 Replies: 13 Views: 815 Posted By Batalov Credit (and SIM-) card numbers have the similar... Credit (and SIM-) card numbers have the similar (not the same (https://en.wikipedia.org/wiki/Luhn_algorithm)) protection from typos and transpositions.
 2021-09-21, 19:31 Replies: 13 Views: 815 Posted By Batalov I've actually been asked, so I could repost here... I've actually been asked, so I could repost here exactly why every "even-length" palindrome is divisible by "11" (think decimal, but it is true for any base b). We could simply say that order of...
 2021-09-17, 17:49 Replies: 13 Views: 815 Posted By Batalov ...but 10^(n)-epsilon has n digits And of... ...but 10^(n)-epsilon has n digits And of course, the only palindrome prime that has an even number of digits (in any base, actually) is "11"! (And even "11" can be composite; then none.) All...
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