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A230483 Strong pseudoprimes (base 2) that become prime when two is subtracted. 4

%I #14 Apr 01 2024 02:38:26

%S 4681,29341,42799,49141,52633,85489,90751,104653,458989,1004653,

%T 1082401,1251949,1302451,1907851,2510569,2811271,3090091,3539101,

%U 5044033,5049001,5489641,5590621,7177105,9069229,9073513,9567673,9995671,10323769,11473885,12263131

%N Strong pseudoprimes (base 2) that become prime when two is subtracted.

%H Amiram Eldar, <a href="/A230483/b230483.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..5001 from Shyam Sunder Gupta)

%e 4681 is a strong pseudoprime (base 2) and 4679 is prime.

%Y Cf. A001567, A001262, A230484, A230485, A230487.

%K nonn

%O 1,1

%A _Shyam Sunder Gupta_, Oct 20 2013

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Last modified April 24 19:52 EDT 2024. Contains 371963 sequences. (Running on oeis4.)