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Results tagged with Search options user 15022

For challenges about identifying and manipulating prime numbers

1
vote
ECMAScript 6 – 107 91 84 bytes n=>eval('for(a=[],x=4;n&&!a[~-n];x++)for(y=2;y*2<=x;)if(x%y++<1){a.push(x);break}a') The function returns an array of the first n composite numbers. Old versions …
answered Sep 8 '15 by Toothbrush
7
votes
JavaScript (ES6), 47 bytes alert(!/^(11+)\1+$/.test('1'.repeat(prompt())))
answered Sep 11 '15 by Toothbrush