question edit history translations

How many prime numbers are there?

less than googol

more than googol, but less the Graham's number

145443097811127

infinitely

The prime number is a natural number that can be divided, without a remainder, only by itself and by 1. For example, 5 can be divided only by 5 and by 1. There are infinitely many primes, as demonstrated by Euclid around 300 BC. The picture above shows the Ulam spiral, which is a graphical depiction of the set of prime numbers.

Ninjai

1

wikimedia wikipedia → Prime number

mathematicsnumbersscience

Numbers quiz Mathematics quiz Science quiz

You will play as

Answers by country

Belgium

9%

0%

0%

90%

11

Greece

0%

0%

14%

85%

14

the Netherlands

4%

8%

4%

83%

24

Canada

0%

5%

5%

83%

18

Austria

6%

6%

2%

82%

80

France

7%

10%

0%

82%

28

Germany

4%

5%

6%

81%

527

Poland

6%

7%

5%

79%

5489

Switzerland

8%

6%

6%

77%

49

Australia

3%

10%

10%

76%

30

the United States

2%

11%

9%

74%

155

Pakistan

13%

0%

13%

73%

15

India

5%

15%

11%

66%

139

Republic of Ireland

16%

5%

11%

66%

18

the United Kingdom

11%

13%

11%

61%

110

Ghana

0%

33%

0%

58%

12

Nigeria

0%

18%

18%

54%

11

What is the sum of the opposite sides of a dice?

Augustus was born on 1 January 10BC. Which birthday did he celebrate at 1 January 10AD?

How many edges does a Möbius strip have?

In maths, what is aleph-zero?

the cardinality of the set of all countable ordinal numbers

the cardinality of the set of all natural numbers

the base value of the natural logarithm

the cardinality of the set of real numbers