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%I #14 Oct 02 2013 15:58:41
%S 3,15,31,35,43,47,51,151,155,175,179,243,247,251,255,339,343,347,355,
%T 359,363,367,371,391,395,403,407,6571,6575,6583,6587,6591,6595,6599,
%U 6603,6607,6611,6615,6619,6623,6627,6631,6635,6655,6659,6675,6679,6683,6687
%N Numbers congruent to 3 in the structure (or curve) of A211000.
%C The behavior seems to be as modular arithmetic but in a growing structure. For n >= 13 the structure is essentially a column of tangent circles of radius 1.
%Y Cf. A211000, A211001, A211003, A211010, A211011, A211020-211023.
%K nonn
%O 1,1
%A _Omar E. Pol_, Mar 30 2012
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