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%I #10 Dec 11 2016 02:51:44
%S 3,3465253618399,374166120095639,12959269432331237,44202753561285409,
%T 1640293473202755797,1640293473202755799,10623546148468360249
%N Smallest of 3 consecutive odd numbers that are primes or strong pseudoprime to base 2.
%C Since a(7) = a(6) + 2, the number a(6) = 1640293473202755797 actually starts a sequence of four consecutive odd numbers which are prime or strong pseudoprimes to base 2. - _M. F. Hasler_, Dec 08 2016
%H S. S. Gupta, <a href="http://www.shyamsundergupta.com/canyoufind.htm">Can You Find no. 48</a>, Oct. 2016.
%e 3465253618399 is in sequence because 3465253618399, 3465253618401, 3465253618403 is a set of 3 consecutive odd number where 3465253618401 is strong pseudoprime base 2 and others are prime.
%Y Cf. A001262, A001567, A230667, A230808.
%K nonn,hard,more
%O 1,1
%A _Shyam Sunder Gupta_, Oct 30 2013
%E Edited by _M. F. Hasler_, Dec 08 2016
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