%I A080198
%S A080198 1,2,4,6,14,34,44,49,137,142,235,333,426,519,710,994,1278,1562,1846,
%T A080198 2130,2414,2698,2982,3266,3550,3834,4118,4402,4686,4970,5254,5538,5822,
%U A080198 6106,6390,6674,6958,7242,7526,7810,8094,8378,8662,8946,9230,9514,9798
%N A080198 Least positive integer multiples of angle x such that their direction 
               cosines form a unit vector: sum(k>0, cos(a(k)*x)^2)=1, where a(1)=1, 
               a(n+1)>a(n) and x=(5/4).
%o A080198 (PARI) x=(5/4); z=cos(x)^2; a=1; for(n=1,64,b=a+1; while(z+cos(b*x)^2>
               1,b++); z=z+cos(b*x)^2; a=b; print1(b,","))
%Y A080198 Cf. A080136, A080137, A080138, A080139, A080140.
%Y A080198 Sequence in context: A151794 A058059 A053686 this_sequence A077637 A077639 
               A039791
%Y A080198 Adjacent sequences: A080195 A080196 A080197 this_sequence A080199 A080200 
               A080201
%K A080198 nonn
%O A080198 1,2
%A A080198 Paul D. Hanna (pauldhanna(AT)juno.com), Feb 04 2003