A050325 Number of factorizations into squarefree factors indexed by prime signatures: A050320(A025487).

1, 1, 1, 2, 1, 2, 1, 2, 5, 1, 3, 2, 6, 1, 3, 2, 6, 1, 3, 9, 2, 15, 4, 6, 1, 3, 10, 2, 21, 4, 6, 1, 3, 10, 2, 22, 4, 16, 6, 1, 13, 3, 35, 5, 10, 2, 22, 4, 19, 6, 1, 14, 3, 52, 41, 5, 10, 2, 22, 4, 20, 6, 1, 14, 3, 83, 42, 5, 26, 10, 2, 66, 17, 22, 4, 20, 55, 6, 6, 1, 14, 3, 93

Offset

1,4

Links

Amiram Eldar, Table of n, a(n) for n = 1..3300

Formula

a(n) = A050320(A025487(n)).

Maple

read(transforms):
a050320 := BFILETOLIST("b050320.txt") :
for n from 1 do
    a050325 := a050320[A025487(n)] ;
    printf("%d %d\n", n, a050325) ;
end do: # R. J. Mathar, May 26 2017

Mathematica

a050320 = Cases[Import["https://oeis.org/A050320/b050320.txt", "Table"], {_, _}][[All, 2]];
lpe = {}; a025487 = {1};
Do[pe = Sort[FactorInteger[n][[All, 2]]]; If[FreeQ[lpe, pe], AppendTo[lpe, pe]; AppendTo[a025487, n]], {n, 2, 10^4}];
A050325[n_] := a050320[[a025487[[n]]]];
Array[A050325, 83] (* Jean-François Alcover, Apr 06 2020 *)

Crossrefs

Cf. A025487, A050320.

Sequence in context: A197945 A099986 A166478 * A332510 A001314 A020733

Adjacent sequences: A050322 A050323 A050324 * A050326 A050327 A050328

Keyword

nonn

Author

Christian G. Bower, Oct 15 1999

Status

approved