What Is The Next Number In The Series - 7, 32, 157, 782, 3907?

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2 Answers

Daniel Bridges Profile
Daniel Bridges answered
It's 19532
difference between each two numbers is 5^n:
32 - 7 = 25 = 5^2 157 - 32 = 125 = 5^3 782 - 157 = 625 = 5^4 3907 - 782 = 3125 = 5^5 so you seek number 5^6 (15625) which you add to number 3907 and it's 19532
Kelly Dodsworth Profile
Kelly Dodsworth answered
First thing i noticed was 7, 32, 157, 782, 3907. Last digits alternate between 2 and 7 with a difference of 5. 2 + 5 = 7 and 7 + 5 = 12.
I also noticed:
32 - 7 = 25
157 - 32 = 125
782 - 175 = 625
3907 - 782 = 3125

This does not give a pattern though but look deeper
5 * 5 = 25
5 * 25 = 125
5 * 125 = 625
5 * 625 = 3125
5 * 3125 = 15625

Go to the start and complete that sequence with the info we have

32 - 7 = 25
157 - 32 = 125
782 - 125 = 625
3907 - 782 = 3125
?  - 3907 = 15625

19532 - 3907 = 15625

Answer 19532 and it  fits the Series, 7, 32, 157, 782, 3907, 19532

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