%I
%S 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,
%T 97,149,241,347,349,443,449,541,547,641,643,647,743,941,947,1447,2441,
%U 2447,3449,4441,4447,5441,5443,5449,6449,8443,8447,14447,14449,24443,44449
%N Primes with either no internal digits or all internal digits are 4.
%Y Cf. A069675, A069676, A069677, A069678, A069680, A069681, A069682, A069683, A069684.
%K nonn,base
%O 1,1
%A _Amarnath Murthy_, Apr 06 2002
%E Corrected by _Ray Chandler_, Nov 24 2003
%E Offset corrected and name changed by Arkadiusz Wesolowski, Sep 07 2011
