# What is the strangest number?

## What is the strangest 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.

## Is 9 a perfect square?

Informally: When you multiply an integer (a “whole” number, positive, negative or zero) times itself, the resulting product is called a square number, or a perfect square or simply “a square.” So, 0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, and so on, are all square numbers.

**Is 36 a triangular number?**

The odd triangular numbers are given by 1, 3, 15, 21, 45, 55. (OEIS A014493), while the even triangular numbers are 6, 10, 28, 36, 66, 78, (OEIS A014494).

**What number means sadness?**

9

### How do you find tetrahedral numbers?

The first few tetrahedral numbers (sequence A000292 in OEIS) are: 1, 4, 10, 20, 35, 56, 84, 120, 165, 220, 286, 364, 455, 560, 680, 816, 969, … -th tetrahedral number is represented by the 3rd Rising Factorial divided by the 3rd Factorial. Tetrahedral numbers can be modelled by stacking spheres.

### Is 12 a triangular number?

For example, the digital root of 12, which is not a triangular number, is 3 and divisible by three.

**What are the prime number from 1 to 100?**

A prime number (or a prime) is a natural number that has exactly two distinct natural number divisors: 1 and itself. For example, there are 25 prime numbers from 1 to 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

**What is the most famous number?**

Try these out for size!

- 911 is most recognizable as the number to call for emergencies.
- 7 is the number most commonly designated as people’s favorite.
- 73 is Sheldon Cooper’s favorite number (on the TV show The Big Bang Theory).
- 10 is most famous because it’s usually the number of items on “top” or “most” lists!

#### Why are numbers important to our life?

Numeracy in everyday life Our confidence and ability with numbers impacts us financially, socially, and professionally. It even affects our health and wellbeing. Some examples of the ways we use maths every day include: Working out how many minutes until our train.

#### What are triangular numbers used for?

A task that may be useful to make the link between these two ideas is Picturing Triangle Numbers. This formula can then be used to discuss: sequences, specifically quadratic sequences; the nth term and substitution into algebraic expressions.

**What is the 12th square number?**

“Is it possible to recreate this up to 12×12?”

0 Squared | = | 0 |
---|---|---|

9 Squared | = | 81 |

10 Squared | = | 100 |

11 Squared | = | 121 |

12 Squared | = | 144 |

**What are the bad luck numbers?**

The number 13 is considered an unlucky number in some countries. The end of the Mayan calendar’s 13th Baktun was superstitiously feared as a harbinger of the apocalyptic 2012 phenomenon. Fear of the number 13 has a specifically recognized phobia, triskaidekaphobia, a word coined in 1911.

## What are the happy numbers between 1 and 100?

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).

## What is the fifth triangular number?

15

**Is 64 a triangular number?**

The first few centered triangular numbers are: 1, 4, 10, 19, 31, 46, 64, 85, 109, 136, 166, 199, 235, 274, 316, 361, 409, 460, 514, 571, 631, 694, 760, 829, 901, 976, 1054, 1135, 1219, 1306, 1396, 1489, 1585, 1684, 1786, 1891, 1999, 2110, 2224, 2341, 2461, 2584, 2710, 2839, 2971, … (sequence A005448 in the OEIS).