A359370 a(n) = 1 if n is not a multiple of 4 and has an even number of prime factors (with multiplicity), otherwise a(n) = 0.

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

Offset

1

Links

Antti Karttunen, Table of n, a(n) for n = 1..100000

Index entries for characteristic functions

Formula

a(n) = A166486(n) - A359372(n).

a(n) = [A358839(n) > 0], where [ ] is the Iverson bracket.

Prog

(PARI) A359370(n) = ((n%4)&&!(bigomega(n)%2));

Crossrefs

Characteristic function of A359371.

Cf. A001222, A166486, A358839, A359372.

Cf. also A359170.

Sequence in context: A027356 A361114 A181663 * A359768 A359787 A247223

Adjacent sequences: A359367 A359368 A359369 * A359371 A359372 A359373

Keyword

nonn

Author

Antti Karttunen, Dec 28 2022

Status

approved