February 2021: Perfect Rectangle Month

This year February is an exact rectangle because it starts on a Monday and it’s not a leap year. But it’s not as rare as I see people claiming (every 200 years apparently‽), it’s about every 10 years. The previous was 2010 and the next is 2027. Courtesy: Matt Parker, Mathematician

Magic of 21!

Maths is fun! Today is the 21st day of the 21st year of the 21st century! To celebrate here is a 21 by 21 magic square which has a magic total of 21.

Math Is Fun

Amazing circle of numbers 1 to 32 without repetition such that the sum of any two adjacent numbers on this circle is a perfect square.

Happy New Year 2021

2021 is the smallest number that can be expressed as the product of two consecutive primes that produces a palindrome when multiplied by its reverse and that is a position in π, e and φ with the same digit. 2021 is the smallest number made from the concatenation of rising consecutive integers that can be... Continue Reading →

Happy Pythagorean Theorem Day

Today is #PythagoreanTheoremDay. Also known as “Right Triangle Day,” it’s a day when the sums of the squares of the month and day equal the square of the last two digits of the year. Clever and elusive, we’re celebrating it now because the next time this happens is in 2025! 📐

Math Is Fun

Q: By the end of the 9th day of the 9th month (i.e. 9th September), the 252nd day of the year, how many minutes had passed this year? A: 9! = 252 days= 9×28 days= 9×28×24 hours= 9x28×24×60 minutes= 9×(7×4)×(8×3)×(6×5×2) minutes= 9×8×7×6×5×4×3×2 minutes= 9! minutes

Math Fun: What Is Emirp?

Do you know what "emirp" is? An emirp is a prime whose reversal is a different prime. A cyclic emirp is an emirp that generates only more emirps when the last digit is successively moved to the front (or vice-versa). The largest known cyclic emirp is 939,391.

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