Видео с ютуба What Are Sad Numbers

Why Some Numbers Are Happy and Others Are Sad: Fun Math Explained!

TOP 5 NUMBERS(number 5 is sad)

Laura day romance / sad number (official music video)

Happy and sad numbers

Number Lore But they are sad (1-26...)

7 and Happy Numbers - Numberphile

Math Investigation Happy and Sad Numbers

Happy Numbers, Sad Numbers, and Happy Primes: Discover the Secrets #happynumbers #sadnumbers

Happy and Sad numbers

HAPPY NUMBER & UNHAPPY (SAD) NUMBER #mathletes_space #happynumber #unhappynumber #sadnumber

Happy numbers and sad numbers

Sad Numbers - Aware (3/22/14 @ Luigi's)