A025692 Index of 2^n within sequence of numbers of form 2^i*6^j.

1, 2, 3, 5, 7, 9, 12, 15, 19, 23, 27, 32, 37, 43, 49, 55, 62, 69, 76, 84, 92, 101, 110, 119, 129, 139, 150, 161, 172, 184, 196, 208, 221, 234, 248, 262, 276, 291, 306, 322, 338, 354, 371, 388, 406, 424, 442, 461, 480, 499, 519, 539, 560, 581, 602, 624, 646, 669, 692, 715

Offset: 0

Author

David W. Wilson

Keywords

• nonn

Comments

Positions of zeros in A025656. - R. J. Mathar, Jul 06 2025

Links

• Robert Israel, Table of n, a(n) for n = 0..2500

Crossrefs

Cf. A000079, A025610.

Programs

Maple

N:= 100: # for a(0)..a(N)
S:= sort([seq(seq(2^i*6^j,i=0..ilog2(2^N/6^j)),j=0..floor(log[6](2^N)))]):
seq(ListTools:-BinarySearch(S,2^i),i=0..N); # Robert Israel, Jan 12 2021

Extensions

Offset corrected by Robert Israel, Jan 12 2021