What is the weirdest number?

An infinite number of weird numbers are known to exist, and the sequence of weird numbers has positive Schnirelmann density. (Sloane). are 2, 4, 4, 11, 13, 16, 16, 57, and 78, and the numbers of digits in the resulting weird numbers are 2, 4, 5, 11, 13, 16, 19, 53, and 74 (E. Weisstein, Dec.

Why is 70 a weird number?

For example, 70 is the lowest weird number, because its set of proper divisors {1,2,5,7,10,14,35} sum to 74, but no subset of its set of proper divisors sum to the number 70, and 70 is the smallest number to meet such conditions.

Is 12 a weird number?

The number 12, for example, is abundant but not weird, because the proper divisors of 12 are 1, 2, 3, 4, and 6, which sum to 16; but 2 + 4 + 6 = 12.

What is a crazy number?

Problem Statement

A crazy number is a number where the magnitude of its consecutive digits differ by 1. For e.g.: Here is a list of all 2 digit crazy numbers: The total number of 2 digit crazy numbers is 17. You can notice that in all the numbers the digits differ only by 1.

Is 836 a weird number?

The first few weird numbers are 70, 836, 4030, 5830, 7192, 7912, 9272, 10430, ... (OEIS A006037). An infinite number of weird numbers are known to exist, and the sequence of weird numbers has positive Schnirelmann density.

The Weird Number

Why is 21 a weird number?

2 21 is a triangle number – it is the sum of the first six whole numbers (1+2+3+4+5+6=21). 3 21 is the eighth number in the Fibonacci sequence, where each number is the sum of the two preceding ones. 4 A shape with 21 sides is called a icosikaihenagon.

What does 6174 mean?

6174 is known as Kaprekar's constant after the Indian mathematician D. R. Kaprekar. This number is renowned for the following rule: Take any four-digit number, using at least two different digits (leading zeros are allowed).

How does 6174 work?

Kaprekar constant, or 6174, is a constant that arises when we take a 4-digit integer, form the largest and smallest numbers from its digits, and then subtract these two numbers. Continuing with this process of forming and subtracting, we will always arrive at the number 6174.

What is a cute number?

A number is called cute if it has exactly four positive integral divisors.

How do you spell 11?

The spelling of 11 in English is Eleven, which means 11 in words can be expressed as Eleven.

How do you spell 14?

14 (fourteen) is a natural number following 13 and succeeded by 15. In relation to the word "four" (4), 14 is spelled "fourteen".

How do you spell 13?

13 in words is written as “Thirteen”. 13 is 3 more than 10.
...
Such as:

1. 13 – Thirteen.
2. 14 – Fourteen.
3. 13 – Thirteen.
4. 16 – Sixteen.
5. 17 – Seventeen.
6. 18 – Eighteen.
7. 19 – Nineteen.

Is 1 a happy number?

The first few happy numbers are 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, ... (OEIS A007770).

Why is 28 the perfect number?

A number is perfect if all of its factors, including 1 but excluding itself, perfectly add up to the number you began with. 6, for example, is perfect, because its factors — 3, 2, and 1 — all sum up to 6. 28 is perfect too: 14, 7, 4, 2, and 1 add up to 28.

What does Semiperfect mean?

Adjective. semiperfect (not comparable) Approaching perfection; not entirely perfect.

What is the 1089 Trick?

The mystery is this: first, take any three digit number, where the first and last digits differ by two or more and reverse the number to produce a new one. Then subtract the smaller from the larger producing another new number. If you reverse this number and this time add the two, the result will always be 1089.

What is this pi?

Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14.

Why is pi so special?

No number can claim more fame than pi. But why, exactly? Defined as the ratio of the circumference of a circle to its diameter, pi, or in symbol form, π, seems a simple enough concept. But it turns out to be an "irrational number," meaning its exact value is inherently unknowable.

What is the most boring number?

There's an old math paradox that says that all natural numbers are interesting, since otherwise there would have to be a smallest uninteresting number, and that in itself is pretty interesting.

What is the most beautiful number?

What Is So Special About The Number 1.61803? The Golden Ratio (phi = φ) is often called The Most Beautiful Number In The Universe. The reason φ is so extraordinary is because it can be visualized almost everywhere, starting from geometry to the human body itself!

Is 7 even or odd?

7 is an odd number.

Is 60 a weird number?

60 is a highly composite number. Because it is the sum of its unitary divisors (excluding itself), it is a unitary perfect number, and it is an abundant number with an abundance of 48. Being ten times a perfect number, it is a semiperfect number. It is the smallest number that is the sum of two odd primes in six ways.

Is 70 a pseudoperfect?

But there is no sum of two or more proper divisors of 70 that adds up to 70, so 70 is not pseudoperfect and is thus called a weird number.