A354032 a(n) = 1 if phi(n)+sigma(n) == 2 (mod 4), otherwise 0.

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

Offset

1

Links

Antti Karttunen, Table of n, a(n) for n = 1..65539

Index entries for characteristic functions

Formula

For n > 1, a(n) = A353812(n) + A354029(n).

Prog

(PARI) A354032(m) = (2==((sigma(m)+eulerphi(m))%4)); \\ See "isok" function in A292763

Crossrefs

Characteristic function of A292763.

Cf. A000010, A000203, A353812, A354029.

Sequence in context: A094934 A245837 A245656 * A285625 A283966 A054354

Adjacent sequences: A354029 A354030 A354031 * A354033 A354034 A354035

Keyword

nonn

Author

Antti Karttunen, May 15 2022

Status

approved