OFFSET
1,2
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..2000
FORMULA
a(n) = n + floor((n-1)*log_3(2)) + floor((n-1)*log_5(2)). [corrected by Jason Yuen, Nov 02 2024]
EXAMPLE
The joint ranking of the powers of 2, 3, 5 begins like this: 1, 2, 3, 4, 5, 8, 9, 16, 25, 27, 32, 64, 81, 125, 128, 243, 256, 512. The numbers 2^n for n >= 0 are in positions 1, 2, 4, 6, 8, 11, 12, 15, 17, 18.
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy,changed
AUTHOR
Clark Kimberling, Jun 16 2013
STATUS
approved