1,2

a(13) has 11111111111 digits and is too large to be included explicitly. [From R. J. Mathar, Aug 10 2010]

Table of n, a(n) for n=1..12.

8 is followed by 9 because 9 is the next lowest number with a digit sum >= 8

9 is followed by 18 because 18 is the next lowest number with a digit sum (1 + 8 = 9) >= 9

Cf. A180083

Sequence in context: A048409 A066565 A095966 * A092596 A118763 A098488

Adjacent sequences: A180081 A180082 A180083 * A180085 A180086 A180087

nonn,base

Dominick Cancilla, Aug 09 2010

a(12) added by R. J. Mathar, Aug 10 2010

approved