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A106138
Semiprimes (mod 2).
0
0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1
OFFSET
1,1
FORMULA
a(n) = A001358(n) mod 2.
MATHEMATICA
Mod[Select[Range[ 327], PrimeOmega[#]==2&], 2] (* James C. McMahon, Jan 31 2024 *)
CROSSREFS
Cf. A001358.
Sequence in context: A343219 A189640 A289057 * A273129 A288936 A064990
KEYWORD
nonn
AUTHOR
Shyam Sunder Gupta, May 07 2005
STATUS
approved