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%I #14 Mar 19 2024 03:17:24
%S 122,127,128,142,5233
%N Numbers k such that A068340(k)=+/-2.
%C Any subsequent terms are > 10^12. - _Lucas A. Brown_, Mar 18 2024
%H Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/A076542.py">Python program</a>.
%o (PARI) isok(k) = abs(sum(i=1, k, i*moebius(i))) == 2; \\ _Michel Marcus_, Jan 14 2023
%Y Cf. A068340, A076542, A077031, A077032, A077033.
%K nonn,more,hard
%O 1,1
%A _Zak Seidov_, Oct 21 2002
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