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A062983 Mertens's function of n (A002321) is not divisible by phi(n). 0
3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
M[n_]:= Sum[MoebiusMu[k], {k, 1, n}]; Select[Range[250], Mod[M[#], EulerPhi[#]]!=0 &] (* Indranil Ghosh, Mar 16 2017 *)
PROG
(PARI) M(n)=sum(k=1, n, moebius(k)); j=[]; for(n=1, 250, if(Mod(M(n), eulerphi(n))!=0, j=concat(j, n))); j
CROSSREFS
Cf. A002321.
Sequence in context: A114637 A009056 A065475 * A081311 A366935 A053233
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 25 2001
STATUS
approved

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)