perplexus.info :: Sequences : Missing Numbers Please

Missing Numbers Please (Posted on 2007-08-21)

What are the missing numbers in this sequence:
0, __, 2, __, 9, __, 20, __, 26, __, 54, __, 77, __

Submitted by Brian Smith

Rating: 4.3333 (6 votes)

Solution: (Hide)

The nth term of the sequence is the sum of the positive integers less than n which are coprime to n. For example the 9th term is 2+4+5+7+8 = 26.

The complete sequence is 0, 0, 2, 3, 9, 5, 20, 15, 26, 19, 54, 23, 77, 41

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Solution	K Sengupta	2008-06-15 00:40:20
Answer	K Sengupta	2008-06-10 23:55:08
re: No Subject	Charlie	2007-08-22 16:53:19
No Subject	armando	2007-08-22 10:10:27
BTW	Charlie	2007-08-22 09:23:36
Solution (spoiler)	Daniel	2007-08-22 01:18:49
hint	Daniel	2007-08-22 01:12:55

Please log in:

Login:
Password:
Remember me:

Sign up! \| Forgot password

Search:

Search body:

Forums (1)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (17)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info