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A114407 7-almost prime gaps. First differences of A046308. 2

%I #11 Oct 13 2019 20:18:05

%S 64,96,32,112,16,32,168,24,32,16,80,32,140,36,48,24,8,32,80,16,32,210,

%T 14,40,56,16,36,12,48,80,40,24,32,16,112,16,80,107,21,60,84,16,8,54,

%U 18,16,56,104,16,60,20,16,16,32,16,8,104,64,24,8,32,80,192,80,10,126,24,12

%N 7-almost prime gaps. First differences of A046308.

%H Zak Seidov, <a href="/A114407/b114407.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = A046308(n+1) - A046308(n).

%e a(1) = 64 = 192-128 where 128 is the first 7-almost prime and 192 is the second.

%e a(2) = 96 = 288-192.

%e a(3) = 32 = 320-288.

%e a(4) = 112 = 432-320.

%e a(5) = 16 = 448-432.

%e a(6) = 32 = 480-448.

%e a(7) = 168 = 648-480.

%e a(8) = 24 = 672-648.

%t Differences[Select[Range[10000],PrimeOmega[#]==7&]] (* _Harvey P. Dale_, Oct 13 2019 *)

%Y Cf. A046308, A065516, A111870, A111871, A114403-A114411, A114412-A114422.

%K easy,nonn

%O 1,1

%A _Jonathan Vos Post_, Nov 25 2005

%E Corrected and extended by _R. J. Mathar_, Aug 31 2007

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Last modified April 24 16:52 EDT 2024. Contains 371962 sequences. (Running on oeis4.)