|
%I #2 Mar 30 2012 18:52:27
%S 1,24,27,33,46,48,51,62,65,69,77,82,87,91,102,105,111,115,116,119,123,
%T 126,132,141,143,144,150,153,156,158,161,162,169,175,180,183,184,192,
%U 200,202,205,206,214,216,221,228,232,234,242,243,244,246,249,252,255,258,259,265,270,272,279,286,287,288
%N Nonprimes of the form c(c(c(c(c(i)-3)-3)-3)-3)-3, where A002808(i)=c(i)=i-th composite.
%e If i=1, then c(c(c(c(c(1)-3)-3)-3)-3)-3=c(c(c(c(4-3)-3)-3)-3)-3=c(c(c(4-3)-3)-3)-3=c(c(4-3)-3)-3=c(c(1)-3)-3=c(4-3)-3=4-3=1=a(1).
%e If i=3, then c(c(c(c(c(3)-3)-3)-3)-3)-3=c(c(c(c(8-3)-3)-3)-3)-3=c(c(c(10-3)-3)-3)-3=c(c(14-3)-3)-3=c(c(11)-3)-3=c(20-3)-3=27-3=24=a(2).
%e If i=4, then c(c(c(c(c(4)-3)-3)-3)-3)-3=c(c(c(c(9-3)-3)-3)-3)-3=c(c(c(12-3)-3)-3)-3=c(c(16-3)-3)-3=c(c(13)-3)-3=c(22-3)-3=30-3=27=a(3).
%e etc.
%Y Cf. A002808.
%K nonn
%O 1,2
%A _Juri-Stepan Gerasimov_, Aug 29 2008
%E Removed incorrect examples. Corrected roughly 20 percent of the values. - R. J. Mathar, Sep 05 2008
|
