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A243095
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Least integer m > 1 such that 4 + m^n is prime or 1 if only 4 + 1^n is prime.
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1
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3, 3, 3, 1, 7, 3, 7, 1, 3, 3, 9, 1, 33, 7, 9, 1, 43, 17, 27, 1, 9, 3, 7, 1, 55, 47, 285, 1, 27, 3, 39, 1, 43, 117, 163, 1, 63, 255, 15, 1, 87, 3, 43, 1, 187, 77, 37, 1, 105, 45, 25, 1, 99, 305, 79, 1, 3, 27, 903, 1, 127, 293, 255, 1, 27, 27, 435, 1, 207, 143, 127, 1, 117, 295, 1159, 1, 477
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OFFSET
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1,1
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COMMENTS
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If n is a multiple of 4 then 4 + m^n is prime iff m = 1.
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LINKS
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PROG
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(PARI)
a(n)=if(n%4==0, return(1)); m=2; while(!ispseudoprime(4+m^n), m++); return(m)
vector(100, n, a(n)) \\ Derek Orr, Aug 29 2014
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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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