A025643 Exponent of 3 (value of i) in n-th number of form 3^i*8^j.

0, 1, 0, 2, 1, 3, 0, 2, 4, 1, 3, 5, 0, 2, 4, 6, 1, 3, 5, 7, 0, 2, 4, 6, 8, 1, 3, 5, 7, 9, 0, 2, 4, 6, 8, 10, 1, 3, 5, 7, 9, 11, 0, 2, 4, 6, 8, 10, 12, 1, 3, 5, 7, 9, 11, 13, 0, 2, 4, 6, 8, 10, 12, 14, 1, 3, 5, 7, 9, 11, 13, 15, 0, 2, 4, 6, 8, 10, 12, 14, 16, 1, 3, 5, 7, 9, 11, 13, 15, 17, 0, 2, 4, 6, 8, 10

Offset: 1

Author

David W. Wilson

Keywords

• nonn

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A025615, A025672.

Programs

Maple

N:= 10^40: # include entries for all 3^i*8^j <= N
map(t -> t[1],sort([seq(seq([i,j],j=0..floor(log[8](N/3^i))),i=0..floor(log[3](N)))],(s,t) -> 3^s[1]*8^s[2]<=3^t[1]*8^t[2]));