A326049 - OEIS

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A326049

a(n) = n - A050449(n), where A050449 is the sum of divisors of the form 4k+1.

6

0, 1, 2, 3, -1, 5, 6, 7, -1, 4, 10, 11, -1, 13, 9, 15, -1, 8, 18, 14, -1, 21, 22, 23, -6, 12, 17, 27, -1, 24, 30, 31, -1, 16, 29, 26, -1, 37, 25, 34, -1, 20, 42, 43, -15, 45, 46, 47, -1, 19, 33, 38, -1, 44, 49, 55, -1, 28, 58, 54, -1, 61, 32, 63, -19, 32, 66, 50, -1, 64, 70, 62, -1, 36, 44, 75, -1, 64, 78, 74, -10, 40

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

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

FORMULA

a(n) = n - A050449(n).

a(n) = A326050(n) + A033879(n).

PROG

(PARI)

A050449(n) = sumdiv(n, d, d*((d % 4) == 1)); \\ From A050449

A326049(n) = (n-A050449(n));

CROSSREFS

Cf. A033879, A050449, A326047, A326048, A326050, A326052.

Sequence in context: A304339 A160400 A325978 * A357684 A072400 A007913

Adjacent sequences: A326046 A326047 A326048 * A326050 A326051 A326052

KEYWORD

sign

AUTHOR

Antti Karttunen, Jun 04 2019

STATUS

approved