can someone be kind enough to explain wat the next number in this sequence is and y. 2,3,5,7,11,13,17____. And also this one. 1,5,14,30,55,91____
2006-08-29 12:19:54 · 9 answers · asked by Anonymous in Education & Reference ➔ Homework Help
first one is prime numbers..find the next # that cannot be divided by anything else but 1 and itself.
second one find the connection:
1 + x = 5? 4
5+ x = 14? 9
14 + x = 30? 16
30 + x = 55? 25
55+x = 91? 36
what do all the numbers have in common?? they are squares of 2, 3, 4, 5, 6.... so the next one would be to add the square of 7 to the previous number, 91. good luck
2006-08-29 12:24:29 · answer #1 · answered by sasmallworld 6 · 1⤊ 0⤋
First series is listing prime numbers (numbers divisible by 1 and itself), so your next number is 19.
The next series adds the square of the number in sequence to the number. You get 5 by adding 2 squared to 1, 14 by adding 3 squared to 5, 30 by adding 4 squared to 14, etc. Since the number after 91 is the 7th in series, you get it by adding 7 squared to 91 (49 + 91), which is 150.
Thanks for the fun!
2006-08-29 19:25:13 · answer #2 · answered by kookoonuts 2 · 0⤊ 0⤋
OK, the second one has terms that are separated by squares (4,9,16,25,36). The next one would be 7^2 or 49 more than 91, so 140.
And like everyone is saying, the first one is prime numbers, so 19.
2006-08-29 19:27:38 · answer #3 · answered by Lea A 5 · 0⤊ 0⤋
The first one is prime numbers. I"ll have to think about the second one.
The second one is adding a series of squares. 1 + 2^2 = 5
5 + 3^2 = 14
and so on.
2006-08-29 19:22:41 · answer #4 · answered by rjguy 3 · 0⤊ 0⤋
2,3,5,7,11,13,17,19 is a series of prime numbers.
1, 5(2^2 + 1), 14 (3^2 + 5), 30 (4^2 + 14), 55 (5^2 + 30), 91(6^2 + 55), 140 (7^2 + 91)
2006-08-29 19:22:23 · answer #5 · answered by knowbuddycares 3 · 0⤊ 0⤋
The first pattern is just prime numbers.
The second pattern is adding perfect squares. Start by adding 4, then 9, then 16, then 25, then 36, ect.
Good luck, hope this helps.
2006-08-29 19:25:47 · answer #6 · answered by SmileyGirl 4 · 0⤊ 0⤋
The first one are prime numbers, (numbers that can not be divided into another whole number).
so from 17 it is 19,23,29,31,37
Second one...
I'm seeing an addition of squares here, except some don't quite fit...
I'm stumped for the second one...
2006-08-29 19:23:16 · answer #7 · answered by borscht 6 · 0⤊ 0⤋
the next number is a prime number. it is the next prime after 17. the other one's order is unknown to me
2006-08-29 19:27:12 · answer #8 · answered by Tanner 1 · 0⤊ 0⤋
you have to figure out what multiples go in all those numbers in those sequences
2006-08-29 19:50:05 · answer #9 · answered by Rj 2 · 0⤊ 0⤋