A077030 Numbers k such that A068340(k)=+/-2.

122, 127, 128, 142, 5233

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..5.

Lucas A. Brown, Python program.

Prog

(PARI) isok(k) = abs(sum(i=1, k, i*moebius(i))) == 2; \\ Michel Marcus, Jan 14 2023

Crossrefs

Cf. A068340, A076542, A077031, A077032, A077033.

Sequence in context: A077376 A194565 A138026 * A280733 A309760 A224606

Adjacent sequences: A077027 A077028 A077029 * A077031 A077032 A077033

Keyword

nonn,more,hard

Author

Zak Seidov, Oct 21 2002

Status

approved