OFFSET
1,1
EXAMPLE
The numbers 9-26 are represented by 40, 41, 42, 43, 44, 45, 46, 47, 48, 80, 81, 82, 83, 84, 85, 86, 87, 88 respectively in base 9/4. Since these are the only two digit integers we have a(2) = 18.
PROG
(Sage)
A=[1]
for i in [1..100]:
A.append(ceil(((9-4)/4)*sum(A)))
[9*x for x in A]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Tom Edgar, Jul 21 2014
STATUS
approved