2021 Fall AMC 12A Problems/Problem 20
Revision as of 22:18, 23 November 2021 by Ehuang0531 (talk | contribs) (Created page with "==Problem== For each positive integer <math>n</math>, let <math>f_1(n)</math> be twice the number of positive integer divisors of <math>n</math>, and for <math>j \ge 2</math>,...")
Problem
For each positive integer 
, let 
be twice the number of positive integer divisors of , and for 
, let 
. For how many values of 
is 
Solution
See Also
| 2021 Fall AMC 12A (Problems • Answer Key • Resources) | |
| Preceded by Problem 19 |
Followed by Problem 21 |
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 | |
| All AMC 12 Problems and Solutions | |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions. 
