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August 29, 2015 13:58
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| bigf = (n) -> | |
| for i in [2..Math.sqrt n] | |
| return n / i unless n % i | |
| n | |
| LPF = (n) -> | |
| bf = bigf n | |
| return bf if bf == n | |
| LPF bf | |
| console.log LPF 600851475143 |
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| factorize = (n) -> | |
| for i in [2..Math.sqrt n] | |
| continue if n % i | |
| [i, n / i] | |
| find = -> | |
| for i in [997..0] | |
| j = parseInt (''+i).split('').reverse().join('') | |
| k = i*1000+j | |
| f = factorize k | |
| for [a, b] in f | |
| if 99 < a && a < 1000 && 99 < b && b < 1000 | |
| return [a, b] | |
| console.log find() |
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