1,2

D. W. Wilson, Table of n, a(n) for n=1..10000

For all 1 < k < 99, k and 11*k have distinct digit sum. 99 and 99*11 = 1089 have the same digit sum 18. Therefore a(11) = 99.

Sequence in context: A088398 A083949 A007471 * A172504 A172502 A118739

Adjacent sequences: A180009 A180010 A180011 * A180013 A180014 A180015

base,easy,nonn

David W. Wilson, Aug 06 2010

approved