Abhishek Verma
intelocode.bsky.social
Abhishek Verma
@intelocode.bsky.social
Coding for 15+ years | IIT Kanpur alumnus | Competitive Programmer: 99.5+ percentile | Posts: Computer Science, Maths & Psychology | Expertise: Problem Solving
The place looks wonderful, I'm sure you had great time !
January 5, 2025 at 1:33 PM
That's the end of thread !

👉 I post about Problem Solving, Computer Science, Mathematics & Psychology.

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January 1, 2025 at 10:45 PM
Bonus fact if you're interested in primes:

2025 + 2 is a prime number
√2025 + 2 is a prime number
2025² + 2 is a prime number
January 1, 2025 at 10:45 PM
Btw, the word "harshad" comes from Sanskrit, harsh (joy) + da (give) meaning joy-giver.

So, I hope current quadrennium of harshad years 2022-2025 fills your life with joy.

This is the last year of the quadrennium and also has an immaculate factorized form:

2025 = 3⁴ * 5²
January 1, 2025 at 10:45 PM
Also, I discovered a fascinating phenomenon for 2+ consecutive Harshad years, is extremely rare.

Note: Harshad number is a number divisible by sum of its digits.

Years 2022-2025 are Harshad years. It last happened 1000+ years back in 1014-1017.

And will next happen after 1000+ years in 3030-3033.
January 1, 2025 at 10:45 PM
Trigonometrically, tangent of 2025° is 1.
Obviously, happens 180 years apart.

And since, 2025 = 27² + 36²

Hence, 2025 can be represented as hypotenuse of a right triangle with integral sides.

Last such year was 1681 ( = 9² + 40²),
Next such year will be 2809 ( = 28² + 45²).
January 1, 2025 at 10:45 PM
2025 is a centered octagonal number.

Such numbers are represented by an octagon with a dot in the center with surrounding dots in successive octagonal layers.

Last such year was 1849,
Next such year will be 2209.
January 1, 2025 at 10:45 PM
As per Nicomachus' theorem:
1³ + 2³ + ... + n³ = (1 + 2 + ... + n)²

Hence, the previous fact can also be stated as 2025 being square of a triangular number.

2025 = (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9)²
January 1, 2025 at 10:45 PM
2025 is also a Cube Year.

2025 = 1³ + 2³ + 3³ + 4³ + 5³ + 6³ + 7³ + 8³ + 9³
= Σ i³

Last such year was 1296,
Next such year will be 3025.
January 1, 2025 at 10:45 PM
2025 is a perfect square ie 45²

Last such year was 1936.
Next such year will be 2116.

In fact, 2025 can be broken in two parts to express as
2025 = (20 + 25)²

Such year had NEVER occurred,
Next such year will be 3025.
January 1, 2025 at 10:45 PM
Hi Fernando 👋

Glad to find you here !
December 5, 2024 at 7:56 PM
Beautiful !
December 26, 2023 at 3:16 PM