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A082129
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Rounded base-2 logarithm of A082128(n+4).
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1
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3, 1, 5, 4, 6, 9, 17, 22, 33, 53, 76, 114, 171, 260, 390, 585, 874, 1311, 1970
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OFFSET
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0,1
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LINKS
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PROG
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(PARI) p=21*4*5*13; for(n=1, 50, v=divisors(p); r=sqrt(p); t=0; for(k=1, matsize(v)[2], if(v[k]>=r, t=k; break)); if(v[t]^2==p, u=t, u=t-1); if(v[t]-v[u]<2, u=u-1; t=t+1); print1(round(log(v[t]-v[u])/log(2))", "); p=p*(v[t]-v[u]))
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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STATUS
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approved
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