A353472 a(n) = 1 if n is a product of a prime and the square of a different prime (p^2 * q), otherwise 0.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0

Offset

1

Links

Antti Karttunen, Table of n, a(n) for n = 1..65537

Index entries for characteristic functions

Index entries for sequences computed from exponents in factorization of n

Formula

a(n) = A353473(n) + A353474(n).

a(n) = [A000005(n) == 3+A001222(n)], where [ ] is the Iverson bracket.

Prog

(PARI) A353472(n) = (numdiv(n) == (3+bigomega(n)));

Crossrefs

Characteristic function of A054753.

Cf. A000005, A001222, A353473, A353474.

Sequence in context: A374100 A323547 A294930 * A359475 A294937 A363131

Adjacent sequences: A353469 A353470 A353471 * A353473 A353474 A353475

Keyword

nonn

Author

Antti Karttunen, Apr 21 2022

Status

approved