%I #16 Mar 19 2024 03:17:20
%S 15,16,5034,5241
%N Numbers k such that A068340(k) = +/-5.
%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))) == 5; \\ _Michel Marcus_, Jan 14 2023
%Y Cf. A068340, A076542, A077030, A077031, A077032.
%K nonn,more,hard
%O 1,1
%A _Zak Seidov_, Oct 21 2002
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