1,2

There are 9*5^(n-1) n-digit terms, hence a(n) << n^k with k = log 5/log 10 = 0.69897.... - Charles R Greathouse IV, May 12 2014

Table of n, a(n) for n=1..64.

100 is not in the sequence since 100 is even but has 2 even digits (both the second and third digits).

998 is in the sequence since 998 is even and the only even digit is the final digit.

Sequence in context: A271168 A292514 A030141 * A246077 A064915 A180648

Adjacent sequences: A242364 A242365 A242366 * A242368 A242369 A242370

nonn,base

J. Lowell, May 12 2014

approved