A365810 Squareferee numbers ordered factorization-wise by Blue code: a(n) = A019565(A193231(n)).

1, 2, 6, 3, 10, 5, 15, 30, 210, 105, 35, 70, 21, 42, 14, 7, 22, 11, 33, 66, 55, 110, 330, 165, 1155, 2310, 770, 385, 462, 231, 77, 154, 858, 429, 143, 286, 2145, 4290, 1430, 715, 5005, 10010, 30030, 15015, 2002, 1001, 3003, 6006, 39, 78, 26, 13, 390, 195, 65, 130, 910, 455, 1365, 2730, 91, 182, 546, 273, 1870, 935

Offset

0,2

Links

Antti Karttunen, Table of n, a(n) for n = 0..16383

Index entries for sequences related to binary expansion of n

Formula

a(n) = A334205(A019565(n)).

Prog

(PARI)
A019565(n) = { my(m=1, p=1); while(n>0, p = nextprime(1+p); if(n%2, m *= p); n >>= 1); (m); };
A193231(n) = { my(x='x); subst(lift(Mod(1, 2)*subst(Pol(binary(n), x), x, 1+x)), x, 2) };
A365810(n) = A019565(A193231(n));

Crossrefs

Permutation of A005117.

Cf. A019565, A193231, A293231, A293443, A334205.

Cf. also A366263.

Sequence in context: A109465 A090705 A208547 * A375281 A167979 A354930

Adjacent sequences: A365807 A365808 A365809 * A365811 A365812 A365813

Keyword

nonn

Author

Antti Karttunen, Oct 06 2023

Status

approved