

A173671


Positive integers that cannot be expressed as 3^m2^n where m and n are integers.


4



3, 4, 6, 9, 10, 12, 13, 14, 15, 16, 18, 20, 21, 22, 24, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 74, 75, 76, 78, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100
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OFFSET

1,1


COMMENTS

The complement of this set, i.e., integers of the form 3^m2^n, is A192111.  M. F. Hasler, Nov 24 2010


LINKS

Table of n, a(n) for n=1..83.
H. Gauchman and I. Rosenholtz (Proposers), R. Martin (Solver), Difference of prime powers, Problem 1404, Math. Mag., 65 (No. 4, 1992), 265; Solution, Math. Mag., 66 (No. 4, 1993), 269.
Math Overflow, 3^n  2^m = +41 is not possible. How to prove it?, Several contributors, Jun 29 2010.


CROSSREFS

Cf. A075824, A074981, A014121, A192110, A192111, A227048, A321671.
Sequence in context: A143037 A225059 A190899 * A325440 A080710 A115837
Adjacent sequences: A173668 A173669 A173670 * A173672 A173673 A173674


KEYWORD

nonn


AUTHOR

Max Alekseyev, Nov 24 2010


EXTENSIONS

Deleted unwarranted programs and bfile.  N. J. A. Sloane, Oct 21 2019


STATUS

approved



