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Semiprimes (mod 7).
1

%I #4 Aug 25 2024 11:53:13

%S 4,6,2,3,0,1,0,1,4,5,5,6,0,3,4,4,0,2,6,1,2,6,2,6,4,0,5,1,2,3,0,2,3,4,

%T 1,6,3,6,0,2,3,4,3,0,1,1,2,3,5,6,1,4,5,0,5,1,2,3,1,3,5,5,5,6,0,2,3,6,

%U 3,4,5,0,1,2,4,2,4,6,2,4,1,2,0,3,6,1,1,5,0,2,4,1,4,5,0,1,2,4,1,6,4,6,1,4,5

%N Semiprimes (mod 7).

%t Mod[Select[Range[400],PrimeOmega[#]==2&],7] (* _Harvey P. Dale_, Aug 25 2024 *)

%Y Cf. A001358.

%K nonn

%O 1,1

%A _Shyam Sunder Gupta_, May 07 2005