A077031 Numbers k such that A068340(k)=+/-3.

6, 130, 5027, 5028

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..4.

Lucas A. Brown, Python program.

Prog

(PARI) isok(k) = abs(sum(i=1, k, i*moebius(i))) == 3; \\ Michel Marcus, Jan 14 2023

Crossrefs

Cf. A068340, A076542, A077030, A077032, A077033.

Sequence in context: A156475 A000907 A188718 * A302770 A337971 A281402

Adjacent sequences: A077028 A077029 A077030 * A077032 A077033 A077034

Keyword

nonn,more,hard

Author

Zak Seidov, Oct 21 2002

Status

approved