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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
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