Palindromic primes in base 16: Difference between revisions
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Found 13 palindromic primes in base 16 |
Found 13 palindromic primes in base 16 |
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done... |
done... |
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</pre> |
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=={{header|Wren}}== |
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{{libheader|Wren-math}} |
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{{libheader|Wren-fmt}} |
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<lang ecmascript>import "/math" for Int |
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import "/fmt" for Conv, Fmt |
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System.print("Primes < 500 which are palindromic in base 16:") |
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var primes = Int.primeSieve(500) |
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var count = 0 |
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for (p in primes) { |
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var hp = Conv.Itoa(p, 16) |
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if (hp == hp[-1..0]) { |
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Fmt.write("$3s ", hp) |
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count = count + 1 |
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if (count % 5 == 0) System.print() |
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} |
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} |
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System.print("\n\nFound %(count) such primes.")</lang> |
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{{out}} |
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<pre> |
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Primes < 500 which are palindromic in base 16: |
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2 3 5 7 B |
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D 11 101 151 161 |
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191 1B1 1C1 |
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Found 13 such primes. |
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</pre> |
</pre> |
Revision as of 14:33, 23 June 2021
Palindromic primes in base 16 is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.
- Task
- Find palindromic primes in base 16, where n < 500
Ring
<lang ring> load "stdlib.ring" see "working..." + nl see "Palindromic primes in base 16:" + nl row = 0 decList = 0:15 baseList = ["0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"] limit = 500
for n = 1 to limit
hex = hex(n) if ispalindrome(hex) and isprime(n) see "" + upper(hex) + " " row = row + 1 if row%5 = 0 see nl ok ok
next
see nl + "Found " + row + " palindromic primes in base 16" + nl see "done..." + nl </lang>
- Output:
working... Palindromic primes in base 16: 2 3 5 7 B D 11 101 151 161 191 1B1 1C1 Found 13 palindromic primes in base 16 done...
Wren
<lang ecmascript>import "/math" for Int import "/fmt" for Conv, Fmt
System.print("Primes < 500 which are palindromic in base 16:") var primes = Int.primeSieve(500) var count = 0 for (p in primes) {
var hp = Conv.Itoa(p, 16) if (hp == hp[-1..0]) { Fmt.write("$3s ", hp) count = count + 1 if (count % 5 == 0) System.print() }
} System.print("\n\nFound %(count) such primes.")</lang>
- Output:
Primes < 500 which are palindromic in base 16: 2 3 5 7 B D 11 101 151 161 191 1B1 1C1 Found 13 such primes.