A082127 Rounded base-3 logarithm of A082126(n).

3, 3, 3, 3, 2, 3, 7, 8, 12, 18, 27, 43, 62, 93, 142, 213, 317, 478, 717, 1073, 1612, 2418, 3627, 5438, 8157, 12238, 18357, 27533

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Prog

(PARI) p=19; 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(3))", "); p=p*(v[t]-v[u]))

Crossrefs

Cf. A082126, A082129.

Sequence in context: A337265 A177228 A247655 * A393830 A097675 A381930

Adjacent sequences: A082124 A082125 A082126 * A082128 A082129 A082130

Keyword

nonn,hard,more

Author

Ralf Stephan, Apr 04 2003

Extensions

Offset changed, missing a(1)=3 inserted and a(22)-a(27) from Sean A. Irvine, Nov 25 2025

Status

approved