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A178053
Digital roots of mountain numbers (cf. A134941).
3
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, 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, 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
OFFSET
1,2
COMMENTS
a(n) = A010888(A134941(n)).
LINKS
R. Zumkeller, Table of n, a(n) for n = 1..21846 (full sequence)
EXAMPLE
A134941(552)=134941 --> 1+3+4+9+4+1=22 --> a(552)=2+2=4.
CROSSREFS
Cf. A178052.
Sequence in context: A121855 A239440 A248355 * A090925 A143836 A168094
KEYWORD
base,fini,full,nonn
AUTHOR
Reinhard Zumkeller, May 25 2010
STATUS
approved