Lets take a number 12 as an example .
It can be partitoned into three integer summands in 12 ways:
12=1+1+10
12=1+2+9
12=1+3+8
12=1+4+7
12=1+5+6
12=2+2+8
12=2+3+7
12=2+4+6
12=2+5+5
12=3+3+6
12=3+4+5
12=4+4+4
Multiplying the 3 members of each partitions results in 12 distinct numbers: 10,18,...60,64.
On the other hand the same treatment applied to number 13 produces a pair of equal results: 13=1+6+6=2+2+9 and 1*6*6=2*2*9=36 (a well known problem of children's ages).
Find the smallest number which has 3 distinct partitions into 3 parts, each of them with the same product.
Bonus: list all numbers below 1000 boasting this feature.
(In reply to
Answer to the bonus. by Charlie)
I admit being being surprised by your findings ; I knew only about 39 & 53 and therefore estimated the quantity will be well below 100.
So: 39 is the smallest integer having this feature (proven!). and 102 - the largest integer not having it.(Charlie's conjecture!)
Ch, i recommend checking for a slightly higher bound (say 2000) and then submitting the list to OEIS.
Enjoy the bonus!
Edited on November 22, 2018, 8:29 am