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

Home > Numbers
Seven-digit Number (Posted on 2023-07-28) Difficulty: 3 of 5
Find a 7-digit decimal number such that:
It is prime;
Its sod() is 38;
The sod() of the first 3 digits is the reverse of the sod() of the last 3 digits;
When it is converted from decimal to base-N, where N is any integer from 11 to 36, all 10 numeric digits and 23 different letters appear, but there is never a Q, S, or Z in its base-N representation (for those bases).

These constraints determine a unique 7-digit number.
Find it.

Bonus: what is its pop culture significance?

Note: the sod(N) is the sum of digits of N

No Solution Yet Submitted by Larry    
Rating: 5.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Answer | Comment 2 of 5 |
8675309 is prime.
8+6+7+5+3+0+9=38
8+6+7=21
3+0+9=12
867-5309 is Jenny's phone number in the song 867-5309/Jenny. To see more interesting facts about the number 8675309, check out my puzzle 8675309.


  Posted by Math Man on 2023-07-28 17:33:42
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (6)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information