A077032 Numbers k such that A068340(k)=+/-4.

3, 4, 137, 5023, 5024, 5025, 5030, 5031, 5032

Offset

1,1

Comments

Any subsequent terms are > 10^12. - Lucas A. Brown, Mar 18 2024

Links

Table of n, a(n) for n=1..9.

Lucas A. Brown, Python program.

Prog

(PARI) isok(k) = abs(sum(i=1, k, i*moebius(i))) == 4; \\ Michel Marcus, Jan 14 2023

Crossrefs

Cf. A068340, A076542, A077030, A077031, A077033.

Sequence in context: A356073 A290282 A331815 * A370385 A041595 A041741

Adjacent sequences: A077029 A077030 A077031 * A077033 A077034 A077035

Keyword

nonn,more,hard

Author

Zak Seidov, Oct 21 2002

Status

approved