Search: id:A053858
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%I A053858
%S A053858 30,42,66,70,78,102,110,114,130,138,154,170,174,182,186,190,222,230,
%T A053858 238,246,258,266,282,286,290,310,318,322,354,366,370,374,402,406,410,
%U A053858 418,426,430,434,438,442,470,474,494,498,506,518,530,534,574,582,590
%N A053858 Even numbers n with an odd number of prime factors.
%F A053858 Even numbers n where mu(n) = -1
%e A053858 a(3)=66 because 66 is even and prime divisors are 2, 3 and 11, an odd 
               number.
%p A053858 ts_m2_sod := proc(n); if (numtheory[mobius](n)=-1 and isprime(n)='false' 
               and type(n,even)='true') then RETURN(n); fi end: am2sod := [seq(ts_m2_sod(i), 
               i=1..2500)]: am2sod;
%Y A053858 A007304.
%Y A053858 Sequence in context: A093599 A007304 A160350 this_sequence A075819 A034683 
               A087248
%Y A053858 Adjacent sequences: A053855 A053856 A053857 this_sequence A053859 A053860 
               A053861
%K A053858 easy,nonn
%O A053858 1,1
%A A053858 Enoch Haga (Enokh(AT)comcast.net), Mar 28 2000

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