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%I #11 Feb 10 2019 03:42:53
%S 1,2,3,7,13,17,43,63,83,167,264,313,707,836,1667,2236,3114,4472,6833,
%T 8167,8937,16667,21886,29614,41833,74833,89437,94863,134164,191833,
%U 298327,545793,547613,947617,987917,1643167,3143167,3162083,5477133
%N Square roots of A068809.
%H Giovanni Resta, <a href="/A068947/b068947.txt">Table of n, a(n) for n = 1..80</a>
%e 13^2 = 169 = A068809(5), so a(5)=13.
%p A007953 := proc(n) option remember: return add(d, d=convert(n, base, 10)): end: A068947 := proc(n) option remember: local k,p: if(n=1)then return 1: fi: k:=procname(n-1): p:=A007953(k^2): do k:=k+1: if(A007953(k^2)>p)then return k: fi: od: end: seq(A068947(n),n=1..20); # _Nathaniel Johnston_, May 04 2011
%Y Cf. A068809, A068948, A068949, A068950, A068952, A069324, A040047.
%K nonn,base
%O 1,2
%A Francois Jooste (phukraut(AT)hotmail.com), Mar 15 2002