OFFSET
0,1
EXAMPLE
The numbers 7-27 are represented by 20, 21, 22, 23, 24, 25, 26, 40, 41, 42, 43, 44, 45, 46, 60, 61, 62, 63, 64, 65, 66 respectively in base 7/2. These are the only integers with two digits, and so a(2)=21.
PROG
(Sage)
A=[1]
for i in [1..60]:
A.append(ceil((7-2)/2*sum(A)))
[7*x for x in A]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
James Van Alstine, Jul 21 2014
STATUS
approved