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A051700
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Distance from n to closest prime that is different from n.
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13
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2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 4, 1, 2, 3, 2, 1, 2, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 1, 2, 1, 2, 1, 2, 1, 4, 1, 2, 3, 2, 1, 6, 1, 2, 3, 2, 1, 2, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 1, 2, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 1, 4, 1, 2, 3, 2, 1, 6, 1, 2, 3, 4, 3, 2, 1, 4, 1, 2, 1, 2, 1, 2, 1
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OFFSET
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0,1
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LINKS
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EXAMPLE
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Closest primes to 0,1,2,3,4 are 2,2,3,2,3.
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MAPLE
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with(numtheory); f := n->min(nextprime(n)-n, n-prevprime(n));
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MATHEMATICA
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Table[Min[NextPrime[n]-n, n-NextPrime[n, -1]], {n, 0, 200}] (* Harvey P. Dale, Mar 27 2011 *)
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CROSSREFS
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KEYWORD
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nonn,easy,nice
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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