II: “ARITHMETICAL MATRICES”: Collections 6 – 9

6. “Diagonal Sums” of Odd and Even Summands

7. Prime Numbers as “Diagonal Sums

8. “Digital Squares” of SemiPrimes

The Triangle (half a square) of Vertical Primes x Horizontal Primes results in more attractive and “diagonally symmetrical” patterns:

9. The “SEQUENTIAL Factorisation” of SemiPrimes

NEXT: III. “DIGITAL TABLES”: Collections 10 – 11

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