OFFSET
1,2
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
Sum_{n>=1} 1/a(n) = (8*9)/((8-1)*(9-1)) = 9/7. - Amiram Eldar, Sep 25 2020
a(n) ~ exp(sqrt(2*log(8)*log(9)*n)) / sqrt(72). - Vaclav Kotesovec, Sep 25 2020
MATHEMATICA
n = 10^6; Flatten[Table[8^i*9^j, {i, 0, Log[8, n]}, {j, 0, Log[9, n/8^i]}]] // Sort (* Amiram Eldar, Sep 25 2020 *)
PROG
(PARI) list(lim)=my(v=List(), N); for(n=0, logint(lim\=1, 9), N=9^n; while(N<=lim, listput(v, N); N<<=3)); Set(v) \\ Charles R Greathouse IV, Jan 10 2018
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
STATUS
approved