Concatenate two primes is also prime: Difference between revisions
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Thundergnat (talk | contribs) (→{{header|Raku}}: Add a Raku example) |
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=={{header|Raku}}== |
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Inefficient, but for a limit of 100, who cares? |
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<lang perl6>my @p = ^1e2 .grep: *.is-prime; |
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say display ( @p X~ @p ).grep( *.is-prime ).unique.sort( +* ); |
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sub display ($list, :$cols = 10, :$fmt = '%6d', :$title = "{+$list} matching:\n") { |
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cache $list; |
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$title ~ $list.batch($cols)».fmt($fmt).join: "\n" |
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}</lang> |
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{{out}} |
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<pre>128 matching: |
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23 37 53 73 113 137 173 193 197 211 |
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223 229 233 241 271 283 293 311 313 317 |
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331 337 347 353 359 367 373 379 383 389 |
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397 433 523 541 547 571 593 613 617 673 |
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677 719 733 743 761 773 797 977 1117 1123 |
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1129 1153 1171 1319 1361 1367 1373 1723 1741 1747 |
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1753 1759 1783 1789 1913 1931 1973 1979 1997 2311 |
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2341 2347 2371 2383 2389 2917 2953 2971 3119 3137 |
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3167 3719 3761 3767 3779 3797 4111 4129 4153 4159 |
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4337 4373 4397 4723 4729 4759 4783 4789 5323 5347 |
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5923 5953 6113 6131 6143 6173 6197 6719 6737 6761 |
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6779 7129 7159 7331 7919 7937 8311 8317 8329 8353 |
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8389 8923 8929 8941 8971 9719 9743 9767</pre> |
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=={{header|Ring}}== |
=={{header|Ring}}== |