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A064905 Semiprimes p1*p2 such that p2 mod p1 = 7. 1

%I

%S 319,697,767,803,1219,1529,1577,1781,1853,2119,2497,2981,3133,3223,

%T 3509,3587,3649,3707,3743,3809,3949,4061,4393,4747,5161,5249,5321,

%U 5401,5837,5899,5909,5983,5989,6127,6509,6611,6631,6931,7633,7697,8063,8203,8473,8797

%N Semiprimes p1*p2 such that p2 mod p1 = 7.

%H Harvey P. Dale, <a href="/A064905/b064905.txt">Table of n, a(n) for n = 0..1000</a>

%t m7Q[n_]:=Module[{f=Transpose[FactorInteger[n]][[1]]},Length[f]==2 && Mod[ f[[2]],f[[1]]]==7]; Select[Range[10000],m7Q] (* _Harvey P. Dale_, May 02 2016 *)

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

%K nonn

%O 0,1

%A _Patrick De Geest_, Oct 13 2001

%E Corrected and extended by _Harvey P. Dale_, May 02 2016

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Last modified September 19 17:19 EDT 2021. Contains 347564 sequences. (Running on oeis4.)