
Number sequence
#1
Posted 13 September 2006 - 02:22 PM
1 2 4 8 15 30 50 100
and told us to find the next term. He gave us some basic hints.
1. The answer will be less than 150
2. The only "tools" needed are those of a fifth grade math student so Im guessing adding, subtracting, multyplying, dividing etc
I had forgotten about this and just remembered it. Its driving me crazy not being able to come up with the solutino, I have my teachers email so I can email him any solution we find here and hell tell us whether we have it or not.
p.s. No one has ever solved this sequence or so he says...
#2
Posted 13 September 2006 - 10:32 PM

I look at the sequence and see that the numbers are never more than doubled, nor less than the sum of the previous 2..
So how do we know if we come up with the solution.. I am inclined to say 100, how do you know if thats correct?
I will keep thinking about it. Are you certain its the correct sequence?
#3
Posted 13 September 2006 - 10:37 PM
#4
Posted 14 September 2006 - 01:29 AM
p.s. No one has ever solved this sequence or so he says...
What does that imply - that the sequence has no solution or that he just made this up for fun?
#5
Posted 14 September 2006 - 05:40 AM

#6
Posted 14 September 2006 - 07:17 AM
http://www.gszi.bme....DF/Chapter5.pdf
#7
Posted 14 September 2006 - 07:52 AM
I am having trouble finding a pattern that yeilds an answer less than 150. My guess is that the next value should be 195. My ligic is that the first four numbers double. The fifth number 15 is the sum of the first four. From there it begins doubling again. The next number would be the fifth after the doubling restarted, so summing the previous 4 numbers yeilds 195.Two years ago my Calculus teacher gave us a simple number sequence
1 2 4 8 15 30 50 100
and told us to find the next term. He gave us some basic hints.
1. The answer will be less than 150
2. The only "tools" needed are those of a fifth grade math student so Im guessing adding, subtracting, multyplying, dividing etc
I had forgotten about this and just remembered it. Its driving me crazy not being able to come up with the solutino, I have my teachers email so I can email him any solution we find here and hell tell us whether we have it or not.
p.s. No one has ever solved this sequence or so he says...
My guess is that a very clever teacher is using this as a way to make kids (and now adults) think about math. There is probably no real answer.
I await the Katabatak breakdown in multiple bases from my hard shelled friend

Bill
ps. This was my 2000th post.
- Boerseun likes this
#8
Posted 14 September 2006 - 08:20 AM
#9
Posted 14 September 2006 - 10:49 AM
oops....forgot it was less than 150.
#10
Posted 14 September 2006 - 10:50 AM
#11
Posted 14 September 2006 - 10:55 AM
#12
Posted 14 September 2006 - 11:01 AM
- Turtle likes this
#13
Posted 14 September 2006 - 04:32 PM
#14
Posted 14 September 2006 - 05:27 PM
.............120...............
#15
Posted 14 September 2006 - 05:28 PM

#16
Posted 14 September 2006 - 05:51 PM
I will tell you if its 110 by tomorrow when he answers my email. Oh and big dog It doesnt double 4 more times since 50 is not two times 30. Boerseun how did you get 110 since the method is more important than the answer



I guess I should stop smoking crack now.
Bill
#17
Posted 14 September 2006 - 05:52 PM
infamous could you please explain what method you used to get 120...thanks
Just guessing my friend...............