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%I #19 Feb 11 2022 15:26:25
%S 3,5,1997,2237,6824897,1356705137,3637803390827
%N First prime in the earliest chain of n consecutive primes with gaps 2^1, 2^2, ..., 2^(n-1).
%H <a href="/index/Pri#gaps">Index entries for primes, gaps between</a>.
%e The earliest chain of 4 consecutive primes separated by gaps 2^1, 2^2, 2^3 is: 1997, 1999, 2003, 2011. Hence a(4) = 1997.
%Y Cf. A000230, A079014.
%K nonn,hard,more
%O 2,1
%A _Joseph L. Pe_, Feb 12 2004
%E a(7)-a(8) from _Donovan Johnson_, Mar 23 2013
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