OFFSET
1,1
EXAMPLE
The numbers 7-13 are represented by 40, 41, 42, 43, 44, 45, 46 respectively in base 7/4. These are the only integers with two digits, and so a(2)=7.
PROG
(Sage)
A=[1]
for i in [1..60]:
A.append(ceil((7-4)/4*sum(A)))
[7*x for x in A]
CROSSREFS
KEYWORD
nonn,base
AUTHOR
James Van Alstine, Jul 21 2014
STATUS
approved