List prime numbers 1 through 100.?

Answer 1

Prime numbers between through 1 to 100 is
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....

Answer 2

Use the Sieve of Eratosthenes method.

Start with 2 3 4 5 6 7 8 ... 98 99 100

First number, 2, is prime. Now delete all multiples of 2:

3 5 7 9 11 ..... 91 93 95 97 99

First number, 3, is prime. Delete all multiples of 3:

5 7 11 13 17 19 23 25 29 .... 91 95 97

First number, 5, is prime. Delete multiples of 5:

7 11 13 17 19 23 29 .... 91 97

First number, 7, is prime. Delete multiples of 7:

11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Can stop when next number > square root of 100. Because product of 2 or more numbers > 10 gives a number > 100.

Combining the first numbers: 2, 3, 5 and 7 with the last list is the required answer.

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

If the numbers are arranged in a grid, the method is easy for small numbers.

Note that, by definition, prime numbers > 1, so 1 is NOT a prime!

Answer 3

2 3 5 7 11 13 17 19 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Answer 4

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

Answer 5

1 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 51 53 59 61 63 67 69 71 73 79 83 87 89 93 97

Answer 6

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

Answer 7

15 is not prime

a quick search will yield many sites like this. (They do not include 1 as prime - not sure why)

you can make your own list fairly quickly as well.

1
2: don't check any more even numbers (50% done)
3: don't check numbers divisible by three (another 1/6 th)
a quick way to check is if the sum of the digits in a number is divisible by three so is the number. ie 765 - sum 7+6+5=18 sum 1+8=9, 9 is divisible by three so 765 is as well.
5: don't check numbers ending in 5
7: from here on out it is best to check each number by all the previous numbers

Answer 8

OK, this is a good warm up drill to get my brain alive-----1, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 87, 89, 91, 97

Answer 9

as per the question their are 27 prime numbers:- 1,2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,
61,67,71,73,79,83,89,91,97

Answer 10

1, 2,,3,5,7, 11,13,15,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97