Palindromic primes: Difference between revisions
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2 3 5 7 b d 11 101 151 161 191 1b1 1c1 |
2 3 5 7 b d 11 101 151 161 191 1b1 1c1 |
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Count: 13 |
Count: 13 |
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</pre> |
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=={{header|Sidef}}== |
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<lang ruby>func palindromic_primes(upto, base = 10) { |
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var list = [] |
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for (var p = 2; p <= upto; p = p.next_palindrome(base)) { |
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list << p if p.is_prime |
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} |
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return list |
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} |
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say palindromic_primes(1000) |
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for n in (1..10) { |
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var count = palindromic_primes(10**n).len |
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say "There are #{count} palindromic primes <= 10^#{n}" |
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}</lang> |
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{{out}} |
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<pre> |
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[2, 3, 5, 7, 11, 101, 131, 151, 181, 191, 313, 353, 373, 383, 727, 757, 787, 797, 919, 929] |
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There are 4 palindromic primes <= 10^1 |
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There are 5 palindromic primes <= 10^2 |
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There are 20 palindromic primes <= 10^3 |
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There are 20 palindromic primes <= 10^4 |
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There are 113 palindromic primes <= 10^5 |
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There are 113 palindromic primes <= 10^6 |
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There are 781 palindromic primes <= 10^7 |
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There are 781 palindromic primes <= 10^8 |
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There are 5953 palindromic primes <= 10^9 |
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There are 5953 palindromic primes <= 10^10 |
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</pre> |
</pre> |
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