Mersenne primes: Difference between revisions

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=={{header|J}}==
<syntaxhighlight lang="j"> (#~I. 1 p: _1 +<: 2x ^ ]) i. 1280
2 3 5 7 13 17 19 31 61 89 107 127 521 607 1279</syntaxhighlight>
 
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