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A077030
Numbers k such that
A068340
(k)=+/-2.
4
122, 127, 128, 142, 5233
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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
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Last modified August 18 17:33 EDT 2024. Contains 375269 sequences. (Running on oeis4.)