%I
%S 1,2,6,42,26,48,92,96,132,20,6,42,26,48,92,96,132,20,6,42,26,48,92,96,
%T 132,20,6,42,26,48,92,96,132,20,6,42,26,48,92,96,132,20,6,42,26,48,92,
%U 96,132,20,6,42,26,48,92,96,132,20,6,42,26,48,92,96,132,20,6,42,26,48
%N Start with 1; add the digits of the previous term and the squares of the digits of the previous term.
%C The sequence becomes periodic after ten steps: a(10) = a(2). Period length is 8, length of the preperiodic part is 2.  Other starting values except 9, 90, 900, ... result in sequences which exhibit essentially the same behavior.
%e 42 > 4 + 2 + 4^2 + 2^2 = 26, 26 > 2 + 6 + 2^2 + 6^2 = 48, ...
%o (PARI) {m=70; a=1; for(j=1,m,print1(a,","); n=a; a=0; while(n>0,d=divrem(n,10); n=d[1]; a=a+(1+d[2])*d[2]))}
%K nonn,base,easy
%O 0,2
%A _N. J. A. Sloane_, Oct 23 2002
%E Edited and extended by _Klaus Brockhaus_, Oct 24 2002
