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 A082121 Smallest difference>1 between d and p/d for any divisor d of the partial product p of the sequence, starting with 7. 1

%I

%S 7,6,11,19,37,109,515,3301,267271,130914197,209015618081,

%T 887384060899271,58605404461258015758293

%N Smallest difference>1 between d and p/d for any divisor d of the partial product p of the sequence, starting with 7.

%o (PARI) p=7; print1(p, ", "); 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(v[t]-v[u]", "); p=p*(v[t]-v[u]))

%Y Cf. A082120, A003681 (starts with 2, 3), A082122.

%K nonn,hard

%O 0,1

%A _Ralf Stephan_, Apr 04 2003

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Last modified June 1 20:49 EDT 2020. Contains 334765 sequences. (Running on oeis4.)