All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Numbers > Sequences
Simple Sequence (Posted on 2007-05-07) Difficulty: 2 of 5
The sequence:

1, 3, 7, 13, 21, ...

What is the 600th member of the series?

What member, above the first, with fewer than 5 digits, is a perfect cube?

What member is a 5-digit palindrome that can also be read as a binary number?

What's the smaller of the two consecutive members that are 1000 apart?

See The Solution Submitted by Charlie    
Rating: 4.0000 (2 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Tease | Comment 1 of 7
Wish I could stay around to offer all.

There is a delightful use of 2 here as we increment through the sequence.

I've determined with massive grey matter destruction that the palindrome is 11111, 10101 or 10001.

Perfect cube?  1681 is a perfect cube and perfect square - but not this time.

What member, above the first,
implies after 1.  2x2x2 = 8.

Sorry, time-out.

  Posted by brianjn on 2007-05-07 09:35:54
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (2)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (1)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2020 by Animus Pactum Consulting. All rights reserved. Privacy Information