The total number of postings fell to 227,227 postings total (not accounting for post duplications), a loss of almost 2,000 postings from last week’s report and a 34% decline from this time last ...

7. The first four triangular numbers are 1, 3, 6 and 10. Why is 10 considered a triangular number? It’s divisible by 3. It’s the sum of three primes. It appears in the Pythagorean theorem.