A178053 - OEIS

%I #7 Mar 21 2013 12:34:34

%S 1,4,5,6,7,8,9,1,2,7,8,9,1,2,3,4,7,9,1,2,3,4,5,8,9,2,3,4,5,6,9,1,2,4,

%T 5,6,7,1,2,3,4,6,7,8,2,3,4,5,6,8,9,3,4,5,6,7,8,1,4,5,6,7,8,9,1,9,2,3,

%U 4,5,6,7,1,2,4,5,6,7,8,2,3,4,6,7,8,9,3,4,5,6,8,9,1,4,5,6,7,8,1,2,5,6,7,8,9

%N Digital roots of mountain numbers (cf. A134941).

%C a(n) = A010888(A134941(n)).

%H R. Zumkeller, <a href="/A178053/b178053.txt">Table of n, a(n) for n = 1..21846</a> (full sequence)

%e A134941(552)=134941 --> 1+3+4+9+4+1=22 --> a(552)=2+2=4.

%Y Cf. A178052.

%K base,fini,full,nonn

%O 1,2

%A _Reinhard Zumkeller_, May 25 2010