A353479 a(n) = 1 if n is a semiprime of the form 4k+3, otherwise 0.

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

Offset

1

Links

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

Index entries for characteristic functions

Formula

a(n) = [A001222(n) == 2] * && [A010873(n) == 3], where [ ] are the Iverson brackets.

a(n) = A353480(n) - A353477(n).

a(n) = A280710(n) * A342025(n) = A353480(n) * A342025(n).

Prog

(PARI) A353479(n) = ((2==bigomega(n)) && (3==(n%4)));

Crossrefs

Characteristic function of A080774.

Cf. A001222, A010873, A064911, A280710, A342025, A353477, A353478, A353480.

Sequence in context: A011729 A297044 A296213 * A360111 A359162 A327932

Adjacent sequences: A353476 A353477 A353478 * A353480 A353481 A353482

Keyword

nonn

Author

Antti Karttunen, Apr 22 2022

Status

approved