The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A179987

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A179987

Digital sums of A108971.
(history; published version)

#3 by Russ Cox at Fri Mar 30 18:51:06 EDT 2012

AUTHOR

_Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), _, Aug 09 2010

Discussion

Fri Mar 30

18:51

OEIS Server: https://oeis.org/edit/global/246

#2 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010

LINKS

R. Zumkeller, <a href="/A179987/b179987.txt">Table of n, a(n) for n = 1..10000</a>

KEYWORD

base,nonn,new

#1 by N. J. A. Sloane at Fri Aug 27 03:00:00 EDT 2010

NAME

Digital sums of A108971.

DATA

1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 9, 10, 11, 10, 9, 8, 7, 6, 5, 4, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 11, 12, 13, 12, 11, 10, 9, 8, 7, 6, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 13, 14, 15, 14, 13, 12, 11, 10, 9, 8, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 15, 16

OFFSET

1,2

COMMENTS

a(n) = A007953(A108971(n));

ABS(a(n+1) - a(n)) = 1 by definition of A108971;

a(A179988(n)) = n and a(m) <> n for m < A179988(n).

LINKS

R. Zumkeller, <a href="b179987.txt">Table of n, a(n) for n = 1..10000</a>

KEYWORD

base,nonn,new

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 09 2010

STATUS

approved