{"id":25000,"date":"2022-12-07T05:26:32","date_gmt":"2022-12-06T23:56:32","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-finding-the-n-th-prime-number-that-is-palindrome-in-base-k\/"},"modified":"2022-12-07T05:26:32","modified_gmt":"2022-12-06T23:56:32","slug":"solved-finding-the-n-th-prime-number-that-is-palindrome-in-base-k","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-finding-the-n-th-prime-number-that-is-palindrome-in-base-k\/","title":{"rendered":"[Solved] Finding the n-th prime number that is palindrome in base K"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-52975921\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"52975921\" data-parentid=\"52974793\" data-score=\"2\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Solution: change palindrome to<\/p>\n<pre><code>int palindrome ( int n,int base)\n    {\n        int isTrue = 1;\n        int digitCount = digitCountBase(n,base);\n        int power = intPow(base,digitCount-1);\n\n        int original = n;\n        while (n&gt;0&amp;&amp; digitCount &gt;0)\n        {\n\n            if (n%base != (original\/power) % base &amp;&amp;digitCount!=1)\n            {\n                isTrue =0;\n                return 0;\n\n            }\n            n=n\/base;\n            power = power \/base;\n            digitCount=digitCount-2;\n        }\n\n        return isTrue;\n\n    }\n<\/code><\/pre>\n<p>How did I find the error:<\/p>\n<ul>\n<li>You are doing only 2 things, primality testing and palindrome testing, so makes sense to check if these are working fine.<\/li>\n<li>Primality testing is easy, count primes from 1 to 10^7 and compare to known values on google. In this case, this works<\/li>\n<li>To test palindrome, pick a working solution from the internet (even if you can\u00b4t submit their solution that uses arrays\/strings, you can test with them!). Then iterate from 1 to 10^7 in a certain base and check that both functions return the same. <\/li>\n<li>Testing with base 3, quickly saw that 56 was not giving same output. And the incorrect one was yours. <\/li>\n<li>Then its a matter of fixing your function, which you now know which one is the problem and even have an example of where its not working<\/li>\n<\/ul><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Finding the n-th prime number that is palindrome in base K <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Solution: change palindrome to int palindrome ( int n,int base) { int isTrue = 1; int digitCount = digitCountBase(n,base); int power = intPow(base,digitCount-1); int original = n; while (n&gt;0&amp;&amp; digitCount &gt;0) { if (n%base != (original\/power) % base &amp;&amp;digitCount!=1) { isTrue =0; return 0; } n=n\/base; power = power \/base; digitCount=digitCount-2; } return isTrue; &#8230; <a title=\"[Solved] Finding the n-th prime number that is palindrome in base K\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-finding-the-n-th-prime-number-that-is-palindrome-in-base-k\/\" aria-label=\"More on [Solved] Finding the n-th prime number that is palindrome in base K\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[457,324,2802],"class_list":["post-25000","post","type-post","status-publish","format-standard","hentry","category-solved","tag-algorithm","tag-c","tag-palindrome"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Finding the n-th prime number that is palindrome in base K - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-finding-the-n-th-prime-number-that-is-palindrome-in-base-k\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Finding the n-th prime number that is palindrome in base K - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Solution: change palindrome to int palindrome ( int n,int base) { int isTrue = 1; int digitCount = digitCountBase(n,base); int power = intPow(base,digitCount-1); int original = n; while (n&gt;0&amp;&amp; digitCount &gt;0) { if (n%base != (original\/power) % base &amp;&amp;digitCount!=1) { isTrue =0; return 0; } n=n\/base; power = power \/base; digitCount=digitCount-2; } return isTrue; ... 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