A326052 a(n) = n - A050452(n), where A050452 is the sum of divisors of the form 4k+3.

1, 2, 0, 4, 5, 3, 0, 8, 6, 10, 0, 9, 13, 7, -3, 16, 17, 15, 0, 20, 11, 11, 0, 21, 25, 26, -3, 21, 29, 12, 0, 32, 19, 34, -7, 33, 37, 19, -3, 40, 41, 32, 0, 33, 27, 23, 0, 45, 42, 50, -3, 52, 53, 24, -11, 49, 35, 58, 0, 42, 61, 31, -10, 64, 65, 52, 0, 68, 43, 28, 0, 69, 73, 74, -18, 57, 59, 36, 0, 80, 51, 82, 0, 74, 85, 43, -3, 77

Offset: 1

Author

Antti Karttunen, Jun 04 2019

Keywords

• sign

Links

• Antti Karttunen, Table of n, a(n) for n = 1..20000

Crossrefs

Cf. A050452, A326047, A326049.

Programs

PARI

A050452(n) = sumdiv(n, d, d*(3==(d % 4)));
A326052(n) = (n-A050452(n));

Formula

a(n) = n - A050452(n).