A369253 - OEIS

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A369253

Parity of A038548, where A038548(n) is the number of divisors of n that are at most sqrt(n).

3

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

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OFFSET

1

COMMENTS

Also parity of the Möbius transform of A369255.

LINKS

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

Index entries for characteristic functions

FORMULA

a(n) = A000035(A038548(n)).

PROG

(PARI) A369253(n) = (sumdiv(n, d, 1-(bigomega(d)%2))%2);

CROSSREFS

Characteristic function of A369254.

Cf. A000035, A065043, A038548, A369255.

Sequence in context: A353787 A297086 A349920 * A167752 A240025 A100923

Adjacent sequences: A369250 A369251 A369252 * A369254 A369255 A369256

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jan 24 2024

STATUS

approved