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Rounded base-2 logarithm of A082128(n+4).
1

%I #9 Dec 27 2023 00:24:42

%S 3,1,5,4,6,9,17,22,33,53,76,114,171,260,390,585,874,1311,1970

%N Rounded base-2 logarithm of A082128(n+4).

%o (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]))

%Y Cf. A082127, A082128.

%K nonn,hard

%O 0,1

%A _Ralf Stephan_, Apr 04 2003