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 A178378 Products of 2 primes that are the difference of 2 primes. 0

%I #3 Mar 30 2012 18:52:41

%S 4,6,9,10,15,22,25,33,34,51,55,58,82,85,87,118,121,123,142,145,177,

%T 187,202,205,213,214,274,289,295,298,303,319,321,355,358,382,394,411,

%U 447,451,454,478,493,505,535,537,538,562,573,591,622,649,681,685,694,697

%N Products of 2 primes that are the difference of 2 primes.

%F a(n)=A124588(m)*A124588(k).

%e a(1)=4 because 4=2*2=(5-3)*(5-3) where 2,3,5 and 5-3 are all prime, a(2)=6 because 6=2*3=(5-3)*(5-2) where 2,3,5,5-3 and 5-2 are all prime.

%Y Cf. A000040, A001358.

%K nonn

%O 1,1

%A _Juri-Stepan Gerasimov_, May 26 2010

%E Extended beyond 478 by _R. J. Mathar_, May 28 2010

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Last modified September 12 07:57 EDT 2024. Contains 375850 sequences. (Running on oeis4.)