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A194367
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Smallest k such that prime(n) divides k*prime(n+1)+1.
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1
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1, 1, 2, 5, 5, 3, 8, 14, 19, 14, 5, 9, 20, 32, 39, 44, 29, 10, 50, 35, 12, 59, 69, 11, 24, 50, 77, 53, 27, 8, 95, 109, 68, 125, 74, 25, 26, 122, 139, 144, 89, 18, 95, 48, 98, 116, 123, 167, 113, 57
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OFFSET
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1,3
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LINKS
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FORMULA
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EXAMPLE
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a(4) = 5 as prime(4)=7 divides 5*11+1, where 11=prime(5).
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MAPLE
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seq(-ithprime(i+1)^(-1) mod ithprime(i), i=1..100); # Robert Israel, Aug 25 2016
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MATHEMATICA
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Table[k = 1; While[! Divisible[k Prime[n + 1] + 1, Prime@ n], k++]; k, {n, 50}] (* Michael De Vlieger, Aug 22 2016 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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