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A064903 Semiprimes p1*p2 such that p2 mod p1 = 5. 1

%I

%S 133,329,403,427,623,721,781,817,917,1079,1211,1241,1417,1507,1603,

%T 1799,1819,1897,1991,2077,2191,2231,2681,2779,2923,2959,2983,3073,

%U 3107,3269,3443,3563,3661,4121,4151,4169,4249,4411,4427,4709,4739,4837,5033

%N Semiprimes p1*p2 such that p2 mod p1 = 5.

%H Harvey P. Dale, <a href="/A064903/b064903.txt">Table of n, a(n) for n = 0..1000</a>

%t sp5Q[n_]:=Module[{f=Transpose[FactorInteger[n]][[1]]},Mod[Last[f], First[ f]] == 5]; Select[Range[5500],PrimeOmega[#]==2&&sp5Q[#]&] (* _Harvey P. Dale_, Aug 12 2014 *)

%Y Cf. A001358 (p2 mod p1 = 0), A064899-A064911.

%K nonn

%O 0,1

%A _Patrick De Geest_, Oct 13 2001

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Last modified August 3 08:21 EDT 2021. Contains 346435 sequences. (Running on oeis4.)