A230484 - OEIS

%I #13 Apr 01 2024 02:38:54

%S 253241,280601,580337,1207361,1678541,1909001,2419385,5173601,

%T 16324001,18073817,22849481,25080101,43363601,60155201,67194401,

%U 82870517,85519337,97924217,100943201,102004421,104857391,116090081,128987429,134696801,135969401,145348529

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

%H Amiram Eldar, <a href="/A230484/b230484.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..5001 from Shyam Sunder Gupta)

%e 253241 is a strong pseudoprime (base 2) and 253243 is prime.

%Y Cf. A001262, A230483, A230485, A230487.

%K nonn

%O 1,1

%A _Shyam Sunder Gupta_, Oct 20 2013