A292582 Restricted growth sequence transform of A292589(n); filter based on the prime signature of {n divided by largest squarefree divisor of n}.

1, 1, 1, 2, 1, 1, 1, 3, 2, 1, 1, 2, 1, 1, 1, 4, 1, 2, 1, 2, 1, 1, 1, 3, 2, 1, 3, 2, 1, 1, 1, 5, 1, 1, 1, 6, 1, 1, 1, 3, 1, 1, 1, 2, 2, 1, 1, 4, 2, 2, 1, 2, 1, 3, 1, 3, 1, 1, 1, 2, 1, 1, 2, 7, 1, 1, 1, 2, 1, 1, 1, 8, 1, 1, 2, 2, 1, 1, 1, 4, 4, 1, 1, 2, 1, 1, 1, 3, 1, 2, 1, 2, 1, 1, 1, 5, 1, 2, 2, 6, 1, 1, 1, 3, 1, 1, 1, 8, 1, 1, 1, 4, 1, 1, 1, 2, 2, 1, 1, 3

Offset

1,4

Comments

Also a restricted growth sequence transform of A278222(A292380(n)): a filter constructed from the runlengths of multiples of 4 encountered in trajectories of A005940-tree.

Links

Antti Karttunen, Table of n, a(n) for n = 1..65536

Index entries for sequences computed from exponents in factorization of n

Prog

(PARI)
rgs_transform(invec) = { my(om = Map(), outvec = vector(length(invec)), u=1); for(i=1, length(invec), if(mapisdefined(om, invec[i]), my(pp = mapget(om, invec[i])); outvec[i] = outvec[pp] , mapput(om, invec[i], i); outvec[i] = u; u++ )); outvec; };
write_to_bfile(start_offset, vec, bfilename) = { for(n=1, length(vec), write(bfilename, (n+start_offset)-1, " ", vec[n])); }
A003557(n) = { my(f=factor(n)); for (i=1, #f~, f[i, 2] = f[i, 2]-1); factorback(f); };
A046523(n) = { my(f=vecsort(factor(n)[, 2], , 4), p); prod(i=1, #f, (p=nextprime(p+1))^f[i]); };  \\ This function from Charles R Greathouse IV, Aug 17 2011
write_to_bfile(1, rgs_transform(vector(16384, n, A046523(A003557(n)))), "b292582.txt");

Crossrefs

Cf. A003557, A005940, A046523, A083399, A278222, A292380, A292583, A292585, A292586, A292587, A292589.

Sequence in context: A005361 A303915 A322885 * A008479 A331178 A227350

Adjacent sequences: A292579 A292580 A292581 * A292583 A292584 A292585

Keyword

nonn

Author

Antti Karttunen, Sep 25 2017

Status

approved