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?

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