The number 70 has some interesting properties. ∙ It’s a pronic number (also called an oblong number)—the product of two consecutive integers: 7 × 10 ∙ It’s the sum of the first seven prime numbers: 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 = 77… wait, let me r…