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A051320
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Euclid-Mullin sequence (A000945) with initial value a(1)=53 instead of a(1)=2.
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1
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53, 2, 107, 3, 7, 11, 2620003, 707431, 1993, 4409, 131, 17, 5, 858127, 79, 163, 19, 46061, 31, 17707, 157, 43, 3135504913004354085487249, 9893869, 149, 1001472037, 16979051, 387853, 61, 13, 227, 41, 206779, 443, 37, 1709
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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a[1]=53; a[n_] := First[ Flatten[ FactorInteger[ 1+Product[ a[ j ], {j, n-1} ] ] ] ]; Array[a, 15]
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PROG
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(PARI) spf(n)=my(f=factor(n)[1, 1]); f
first(m)=my(v=vector(m)); v[1]=53; for(i=2, m, v[i]=spf(1+prod(j=1, i-1, v[j]))); v \\ Anders Hellström, Nov 26 2015
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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