%I A064221
%S A064221 4,1,3,19,33,4,165,35,150,35,205,35,63,435,48,4,223,399,388,149,125,86,
%T A064221 335,491,565,876,73,250,85,526,217,139,557,676,488,629,592,1290,2110,
%U A064221 366,140,2461,6198,6476,2033,751,7258,2054,2275,1345,445
%N A064221 Least k such that k*12^n +/- 1 are twin primes.
%t A064221 Do[ k = 1; While[ ! PrimeQ[ k*12^n + 1 ] || ! PrimeQ[ k*12^n - 1 ], k++ 
               ]; Print[ k ], {n, 0, 50} ]
%Y A064221 Cf. A063983.
%Y A064221 Sequence in context: A156224 A162516 A085471 this_sequence A152890 A143354 
               A106141
%Y A064221 Adjacent sequences: A064218 A064219 A064220 this_sequence A064222 A064223 
               A064224
%K A064221 nonn
%O A064221 1,1
%A A064221 Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 21 2001