A077033 Numbers k such that A068340(k) = +/-5.

15, 16, 5034, 5241

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))) == 5; \\ Michel Marcus, Jan 14 2023

Crossrefs

Cf. A068340, A076542, A077030, A077031, A077032.

Sequence in context: A041478 A042099 A156530 * A043669 A043704 A329177

Adjacent sequences: A077030 A077031 A077032 * A077034 A077035 A077036

Keyword

nonn,more,hard

Author

Zak Seidov, Oct 21 2002

Status

approved