11 lines
230 B
JavaScript
11 lines
230 B
JavaScript
function isKaprekar( n, bs ) {
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if ( n < 1 ) return false
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if ( n == 1 ) return true
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bs = bs || 10
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for (var a=n*n, b=0, s=1; a; s*=bs) {
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b += a%bs*s
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a = Math.floor(a/bs)
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if (b && a + b == n) return true
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}
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return false
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}
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