Shade some squares in the grid so that:
Squares with numbers are unshaded.
Each number is equal to the product of the number of unshaded squares it can “see”
in its row and column. (A square can see another square if they’re in the same row or
column and the sight line between them doesn’t have...
What are the two missing letters (indicated by __)
PROBLEM
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YM MD HP __
Can you find a set of 11 positive integers such that the product of every pair of numbers plus one is a distinct prime? So the set should generate 55 distinct primes. Computers are allowed.
Some of you math nerds may be looking forward to the year 2025 because it's a square number: $2025 = 45^2$.
But not just any square number: It's the square of the sum of the two-digit numbers resulting from cutting the digit string in half: $2025 = (20 + 25)^2$.
This is a rare phenomenon that wil...
What are the two missing letters (indicated by __)
PROBLEM
PROBLEM
PROBLEM
PROBLEM
PROBLEM
PROBLEM
PROBLEM
PROBLEM
PR0BLEM
PROBLEM
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PROBLEM
YM MD HP __
Can you find a set of 11 positive integers such that the product of every pair of numbers plus one is a distinct prime? So the set should generate 55 distinct primes. Computers are allowed.
