A178053 Digital roots of mountain numbers (cf. A134941).

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

Adjacent sequences: A178050 A178051 A178052 * A178054 A178055 A178056

Keyword

base,fini,full,nonn

Author

Reinhard Zumkeller, May 25 2010

Status

approved