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A204894
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Least prime p such that n divides p-q for some prime q<p.
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3
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3, 5, 5, 7, 7, 11, 17, 11, 11, 13, 13, 17, 29, 17, 17, 19, 19, 23, 41, 23, 23, 29, 53, 29, 53, 29, 29, 31, 31, 37, 67, 37, 71, 37, 37, 41, 79, 41, 41, 43, 43, 47, 89, 47, 47, 53, 97, 53, 101, 53, 53, 59, 109, 59, 113, 59, 59, 61, 61, 67, 127, 67, 131, 67, 67, 71
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OFFSET
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1,1
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COMMENTS
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For a guide to related sequences, see A204892.
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(PARI) a(n)=forprime(p=n+2, , forstep(k=p%n, p-1, n, if(isprime(k), return(p)))) \\ Charles R Greathouse IV, Mar 20 2013
(PARI) a(n)=if(isprime(n+2), return(n+2)); my(s=if(n%2, 2*n, n), t); forprime(p=s+3, , t=p%n; forstep(q=if(t%2, t, t+n), p-s, s, if(isprime(q), return(p)))) \\ Charles R Greathouse IV, Jul 17 2015
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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