OFFSET
1,1
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..2000
FORMULA
a(n) = 1 + A066344(n).
a(n) = 1 + floor(n*(1 + log_5(2))).
EXAMPLE
The joint ranking of the powers of 2 and of 5 begins like this: 1, 2, 4, 5, 8, 16, 25, 32, 64, 125, 128, 256, 512. The numbers 2^n for n >= 1 are in positions 2, 3, 5, 6, 8, 9, 11, 12, 13.
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy,changed
AUTHOR
Clark Kimberling, Jun 16 2013
STATUS
approved