A082127 - OEIS

A082127

Rounded base-3 logarithm of A082126(n).

3, 3, 3, 2, 3, 7, 8, 12, 18, 27, 43, 62, 93, 142, 213, 317, 478, 717, 1073, 1612, 2418

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

Table of n, a(n) for n=0..20.

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. A082129.

Sequence in context: A372748 A087497 A085767 * A031354 A307486 A259301

Adjacent sequences: A082124 A082125 A082126 * A082128 A082129 A082130

KEYWORD

nonn,hard

AUTHOR

Ralf Stephan, Apr 04 2003

STATUS

approved