OFFSET
1,1
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
FORMULA
A069352(a(n)) mod 2 = 1.
Sum_{n>=1} 1/a(n) = 5/4. - Amiram Eldar, Feb 18 2021
MATHEMATICA
max = 53000; Reap[Do[k = 2^i*3^j; If[k <= max && OddQ[i + j], Sow[k]], {i, 0, Log[2, max] // Ceiling}, {j, 0, Log[3, max] // Ceiling}]][[2, 1]] // Union (* Amiram Eldar, Feb 18 2021 after Jean-François Alcover at A036667 *)
PROG
(Haskell)
a257999 n = a257999_list !! (n-1)
a257999_list = filter (odd . flip mod 2 . a001222) a003586_list
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, May 16 2015
STATUS
approved