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A167629 The odd composites n such that n=q*g*j*y/2 and q+g=j*y where q,g,j,y are distinct primes. 1

%I #4 Mar 31 2012 14:00:55

%S 105,195,231,399,627,897,935,1023,1443,1581,1729,2465,2915,2967,4123,

%T 4301,4623,4715,5487,7055,7685,7881,8099,9717,10707,11339,12099,12995,

%U 14993,16377,16383,17353,17423,19599,20213,20915,23779,24963,25327

%N The odd composites n such that n=q*g*j*y/2 and q+g=j*y where q,g,j,y are distinct primes.

%e a(1)=3*7*5=105 (q=3, g=7, j=2, y=5); a(2)=13*3*5=195 (q=2, g=13, j=3, y=5); a(3)=3*11*7=231 (q=3, g=11, j=2, y=7); a(4)=19*3*7=329 (q=2, g=19, j=3, y=7); a(5)=3*19*11=627 (q=3, g=19, j=2, y=11).

%Y Cf. A000040, A157931.

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, Nov 07 2009

%E Corrected and extended by _D. S. McNeil_, Dec 10 2009

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)